Fruit, very soft, put in drink (5)
I believe the answer is:
apple
'fruit' is the definition.
(apple is a kind of fruit)
'very soft put in drink' is the wordplay.
'very soft' becomes 'pp' (musical abbreviation for pianissimo).
'put in' means one lot of letters goes inside another.
'drink' becomes 'ale' (type of beer).
'pp' going within 'ale' is 'APPLE'.
(Other definitions for apple that I've seen before include "Crisp fruit" , "Sweet or tart fruit" , "Pupil" , "Fruit from Eden?" , "Eve's fruit" .)