Some seafood to throw over back of trawler mostly (7)
I believe the answer is:
lobster
'some seafood' is the definition.
(lobster is a kind of seafood)
'throw over back of trawler mostly' is the wordplay.
'throw' becomes 'lob' (to lob something is to chuck or throw it).
'over' is a charade indicator (letters next to each other).
'back of' says the letters should be written in reverse (I've seen 'back' mean this).
'trawler mostly' becomes 'rets' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'rets' reversed gives 'ster'.
'lob'+'ster'='LOBSTER'
'to' is the link.
Can you help me to learn more?
(Other definitions for lobster that I've seen before include "Bolster up the sea-creature" , "Bolster (anag.)" , "Crustacean caught in pot" , "One showing claws" , "Large marine decapod" .)