Fruit and nut, alas, is all mixed together (7)
I believe the answer is:
sultana
'fruit' is the definition.
(sultana is a kind of fruit)
'nut alas is all mixed together' is the wordplay.
'nut alas' can be anagrammed to 'SULTANA'.
But, I am unsure how this is indicated.
'and' acts as a link.
Can you help me to learn more?
(Other definitions for sultana that I've seen before include "Queen of fruits?" , "Dried pale yellow seedless grape" , "sovereign's woman" , "Sovereign's mistress" , "bit of a fruit cake" .)