Sticky bit of an argument (3)
I believe the answer is:
gum
'sticky bit' is the definition.
The answer and definition can be both things that one consumes for nourishment as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'of an argument' is the wordplay.
'of' indicates the answer is hidden within the clue.
'GUM' can be found hidden inside 'argument'.
Can you help me to learn more?
(Other definitions for gum that I've seen before include "Leaving body" , "seal" , "surrounding roots of teeth?" , "Adhesive for chewing" , "Glue; jelly-like sweet" .)