Kills fish and meat (7)
I believe the answer is:
topside
'meat' is the definition.
(cut of beef)
'kills fish' is the wordplay.
'kills' becomes 'tops'.
'fish' becomes 'ide' (I've seen this before).
'tops'+'ide'='TOPSIDE'
'and' is the link.
(Other definitions for topside that I've seen before include "Lean cut of beef, no bone" , "Joint" , "Towards ship's upper decks; part of cut of beef" , "Dish" , "Outer cut of beef" .)