Soft, edible part of a crab apple (3)

I believe the answer is:

bap

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'soft edible part' is the definition.
The definition suggests a singular noun which matches the answer.

'of a crab apple' is the wordplay.
'of' indicates a hidden word.
'BAP' is hidden within 'a crab apple'.

Can you help me to learn more?

(Other definitions for bap that I've seen before include "Flattish bread roll" , "Big roll" , "Large soft bread roll" , "A soft flat bread roll" , "Large flat round roll" .)

I've seen this clue in the Evening Standard.

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