His aim's to produce fish (7)
I believe the answer is:
'fish' is the definition.
(I have seen 'raw fish' mean 'sashimi' so perhaps 'fish' could also mean 'sashimi')
'his aim's to produce' is the wordplay.
'to produce' indicates an anagram.
'hisaims' with letters rearranged gives 'SASHIMI'.
(Other definitions for sashimi that I've seen before include "Japanese raw fish dish - his aims (anag)" , "food in Japan" , "fish food?" , "Japanese raw fish - I'm as his (anag)" , "Japanese dish of thinly sliced raw fish" .)