Long drink containing peel from plump fruit (9)
I believe the answer is:
pineapple
'fruit' is the definition.
(pineapple is a kind of fruit)
'long drink containing peel from plump' is the wordplay.
'long' becomes 'pine' (to pine for someone is to long for them).
'drink' becomes 'ale' (type of beer).
'containing' means one lot of letters goes inside another.
'peel from' suggests removing the centre (outside letters might be called the word's peel).
'plump' with its centre taken out is 'pp'.
'ale' enclosing 'pp' is 'apple'.
'pine'+'apple'='PINEAPPLE'
(Other definitions for pineapple that I've seen before include "Juicy tropical fruit or slang hand grenade" , "Fruit (tree and fruit!)" , "Juicy tropical fruit often sold segmented" , "bomb" , "Fruit grown on ground" .)