Alas, nut wrong fruit! (7)
I believe the answer is:
sultana
'fruit' is the definition.
(sultana is a kind of fruit)
'alas nut wrong' is the wordplay.
'wrong' is an anagram indicator.
'alas'+'nut'='alasnut'
'alasnut' anagrammed gives 'SULTANA'.
(Other definitions for sultana that I've seen before include "Small dried fruit" , "sovereign's woman" , "Shrivelled up" , "Dried white grape" , "Dried pale yellow seedless grape" .)