Is it keen to help you enjoy your ham? (7)
I believe the answer is:
mustard
'ham?' is the definition.
The definition and answer 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?
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for mustard that I've seen before include "Hot condiment" , "Yellow sauce" , "leading performer in wet conditions" , "Standard of keenness" , "Yellow paste as condiment - very keen" .)