Fruit beer — keeping very quiet (5)
I believe the answer is:
apple
'fruit' is the definition.
(apple is a kind of fruit)
'beer keeping very quiet' is the wordplay.
'beer' becomes 'ale' (type of beer).
'keeping' indicates putting letters inside.
'very quiet' becomes 'pp'.
'ale' going around 'pp' is 'APPLE'.
(Other definitions for apple that I've seen before include "Adam had one!" , "The - Cart (Shaw)" , "Fruit that's Big in the US" , "One poisoned Disney's Snow White" , "Eg, Bramley, Braeburn" .)