Starting with cake (4)
I believe the answer is:
tart
'cake' is the definition.
The answer and definition can be both things that one consumes for nourishment as well as being singular nouns.
Maybe you can see an association between them that I can't see?
'starting with' is the wordplay.
'with' indicates a hidden word.
'TART' is hidden within 'starting'.
Can you help me to learn more?
(Other definitions for tart that I've seen before include "Of taste, sharp or acid" , "Sharp; pastry" , "Bitter - sweet - floozie" , "Bitter - pudding" , "Sarcastic" .)