Sole fruit? (4)
I believe the answer is:
sloe
'fruit?' is the definition.
(I've seen this before)
'sole' is the wordplay.
'sole' anagrams to 'SLOE'.
Though, I'm not sure how the anagram is indicated.
Can you help me to learn more?
(Other definitions for sloe that I've seen before include "Blackthorn, used in making a type of gin" , "Wild plum" , "Thorny bush with plum-like fruit" , "Fruit steeped in gin to make a liqueur" , "Sour blue-black fruit" .)