Drink containing skin of plump fruit (5)
I believe the answer is:
apple
'fruit' is the definition.
(apple is a kind of fruit)
'drink containing skin of plump' is the wordplay.
'drink' becomes 'ale' (ale is a kind of drink).
'containing' is an insertion indicator.
'skin of' means to remove the middle letters.
'plump' with its centre removed is 'pp'.
'ale' enclosing 'pp' is 'APPLE'.
(Other definitions for apple that I've seen before include "Pipped fruit" , "Eg, Bramley, Braeburn" , "Dressing; Irish county" , "Beneficiary of 23 [LOVELACE]" , "Pome fruit" .)