Starting with cake (4)

I believe the answer is:

tart

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'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" .)

I've seen this clue in The Mirror.

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