Unusual chain - it turned red (7)
I believe the answer is:
chianti
'red' is the definition.
(I know that Chianti is a type of red)
'unusual chain it turned' is the wordplay.
'unusual' indicates anagramming the letters.
'turned' says the letters should be written in reverse.
'it' written backwards gives 'ti'.
'chain' with letters rearranged gives 'chian'.
'chian'+'ti'='CHIANTI'
(Other definitions for chianti that I've seen before include "Italian wine - mountain range" , "Tuscan red wine" , "I can hit (anag) - alcoholic drink" , "Dry red Italian wine" , "Wine produced in Tuscany" .)