Use covering of tinfoil to wrap uncooked fish (5)
I believe the answer is:
trawl
'fish' is the definition.
(trawl can mean to fish)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for trawl that I've seen before include "Large net used for fishing" , "Fish by dragging bag-net along sea bed" , "Comb" , "hunt" , "Fishermen may use it" .)