Surprisingly cheap fruit (5)
I believe the answer is:
peach
'fruit' is the definition.
(type of fruit)
'surprisingly cheap' is the wordplay.
'surprisingly' indicates an anagram (a surprising ordering of the letters).
'cheap' with letters rearranged gives 'PEACH'.
(Other definitions for peach that I've seen before include "Type of stone fruit" , "Fruit - beauty" , "Inform on" , "Pinkish-orange colour" , "Cheap (anag.)" .)