Marker above「tongue in mouth, tonguing mouth」: use of this element with 'eating, gulping, swallowing' and as 'bird beak' suggests the marker is above「mouth with tongue inside」MOUTH WIDE OPEN. As STARING BLANKLY in a STUPOR, perhaps someone who walks around open-mouthed most of the time and showing「tongue in mouth」gaping wide open not unlike a small chick vying with siblings wanting to be fed by an adult bird returning to the nest to discharge sticky liquids with chunks down the chick's open throat, as nourishment (…beginning to understand why prepubescent service providers and clients were referred to as「chicks」and「cocks」respectively?).
With the glyph elements of a「tonguing mouth, rod in mouth orifice, raised rod in containment cavity」that has opened with an emphasis marker, the meanings of WHITE and CONSPICUOUS, STARING BLANKLY then become apparent as a reference to material situated upon the tongue's surface, and, likely being displayed as requested by a client for inspection prior to use of the tongue and mouth for fellatio. WHITE spots on the tongue and other parts of the mouth indicate oral gonorrhea, and in a very bad way.
[ https://www.mouthhealthy.org/en/az-topics/s/sexually-transmitted-diseases 2019-09-16 CAUTION: be very careful when loading and viewing the images on this site ]
Some scholars suggest may be due to protruding WHITE teeth, often caused by sucking for long periods on a hard object such as a thumb while a child, large front incisors (that make 'incisions') known as malocclusion 'buck teeth' (males of rabbit species are 'bucks') CONSPICUOUS and WHITE…unfortunately, if adult folks 4,000 years ago still even had teeth remaining in their head at adult age, those teeth were likely most any color other than white, hence this explanation is rather fanciful. Others assert, also rather fancifully, that this glyph somehow depicts a thumbnail (?).
Note that the following colors are all associated with the human body and its various emissions or conditions: black (黒, 黑). Purple (紫). Blue (靑,青). Green (緑,綠). Yellow (黄,黃). Orange (橙). Red (赤). And white (白). It has been suggested that「off-color jokes」originated from the various meanings in these glyphs being brought back by the English from China that made light of emissions, body parts, or some other sort of stuff not being a healthy color, i.e., the color is 'off' for some reason and humorously ridiculed as a result.

External source definitions …excluding politically incorrect concepts and other meanings deemed offensive today; may include extended definitions, euphemisms, and mnemonics)
Chinese: white; snowy; pure; bright; empty; blank; plain; clear; to make clear; in vain; gratuitous; free of charge; reactionary; anti-communist; funeral; to stare coldly; to write wrong character; to state; to explain; vernacular; spoken lines in opera
Japanese EDRDG: white
Unihan extended: white; pure, unblemished; bright

Used within names (nanori)
あき　･　か　･　はっ