Foremost of hunted fish in list (4)
I believe the answer is:
heel
'list' is the definition.
(thesaurus)
'foremost of hunted fish' is the wordplay.
'foremost of' suggests taking the first letters.
'fish' becomes 'eel' (eel is a kind of fish**).
The initial letter of 'hunted' is 'h'.
'h'+'eel'='HEEL'
'in' acts as a link.
(Other definitions for heel that I've seen before include "Instruction to a dog" , "horrible person" , "Crusty end of a loaf" , "See 21" , "swine" .)