Appear keen to serve venison one day? (4)
I believe the answer is:
fawn
'appear' is the definition.
The definition and answer can be both related to bodily activities as well as being verbs in their base form.
Perhaps you can see an association between them that I can't see?
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for fawn that I've seen before include "crawl" , "Light brown colour" , "Bear does, maybe" , "Flatter, be obsequious like young deer" , "Behave obsequiously like young deer" .)