Fruit pip one ignored in drink (5)
I believe the answer is:
apple
'fruit' is the definition.
(I know that apple is a type of fruit)
'pip one ignored in drink' is the wordplay.
'one' becomes 'i' (Roman numeral).
'ignored' is a deletion indicator.
'in' is an insertion indicator.
'drink' becomes 'ale' (type of beer).
'pip' with 'i' taken away is 'pp'.
'pp' inserted within 'ale' is 'APPLE'.
(Other definitions for apple that I've seen before include "Tree of the rose family" , "Pupil" , "Jonathan, for example" , "Crab, cooking or eating fruit" , "New York the Big one" .)