Fish is right, when turned, to eat (7)
I believe the answer is:
sardine
'fish' is the definition.
(sardine is a kind of fish)
'right when turned to eat' is the wordplay.
'right' becomes 'r' (common abbreviation).
'when' becomes 'as'.
'turned' says the letters should be written in reverse.
'to eat' becomes 'dine' (dining is a kind of eating).
'r'+'as'='ras'
'ras' backwards is 'sar'.
'sar'+'dine'='SARDINE'
'is' is the link.
(Other definitions for sardine that I've seen before include "Fish (often tinned)" , "Small pilchard" , "Rinsed a (anag) - fish" , "A diner's small fish" , "Swimmer" .)