Fishhook attachment
I believe the answer is:
snell
'fishhook attachment' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for snell that I've seen before include "Lynda --, character in The Archers" , "man of the law" , "Keen Scottish" , "Soprano Eleanor" , "sharp, concerning the wind" .)