Last of such fish in list (4)
I believe the answer is:
heel
'list' is the definition.
(thesaurus)
'last of such fish' is the wordplay.
'last of' suggests the final letters.
'fish' becomes 'eel' (eel is a kind of fish**).
The final letter of 'such' is 'h'.
'h'+'eel'='HEEL'
'in' is the link.
(Other definitions for heel that I've seen before include "Part of shoe; bad person" , "afoot?" , "Crusty end of a loaf" , "despicable person" , "Back part of the foot" .)