A little grape, a ripe fruit (4)
I believe the answer is:
pear
'fruit' is the definition.
(I know that pear is a type of fruit)
'a little grape a ripe' is the wordplay.
'a little' indicates a hidden word.
'PEAR' is hidden within 'grape a ripe'.
(Other definitions for pear that I've seen before include "Fruit (maybe Conference?)" , "Brilliant" , "Tasty fruit that tapers towards the stalk" , "Brand" , "Pomaceous fruit" .)