Went back to play with feeble physique (5)

I believe the answer is:

weedy

'with feeble physique' is the definition.

'went back to play' is the wordplay.
'went' becomes 'weed' ('go' can mean to urinate).
'back to' says to take the final letters.
The last letter of 'play' is 'y'.
'weed'+'y'='WEEDY'

(Other definitions for weedy that I've seen before include "Skinny" , "Thin, puny (colloq.)" , "quite unlike Charles Atlas" , "Underdeveloped" , "like an untended flower bed?" .)

I've seen this clue in The Guardian.

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