Feeble person - quiet swimmer - added zest (5,4)

I believe the answer is:

lemon peel

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'zest' is the definition.
(I've seen this before)

'feeble person quiet swimmer added' is the wordplay.
'feeble person' becomes 'lemon' (I can't justify this - if you can you should give a lot more credence to this answer).
'quiet' becomes 'p' (music symbol for 'piano', ie soft or quiet).
'swimmer' becomes 'eel' (eel is a type of fish).
'added' says to put letters next to each other.
'lemon'+'p'+'eel'='LEMON PEEL'

Can you help me to learn more?

(Other definitions for lemon peel that I've seen before include "twist" , "Source of zest" .)

I've seen this clue in The Daily Express.

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