Leave part of fishing tackle in fish (6,3)
I believe the answer is:
conger eel
'fish' is the definition.
(conger eel is a kind of fish)
'leave part of fishing tackle' is the wordplay.
I cannot quite understand how this works, but
'leave' could be 'conge' (I've seen this in other clues) and 'conge' is found within the answer.
'part' could be 'reel' (I have seen 'Part of film' mean 'reel' so perhaps 'part' could also mean 'reel') and 'reel' is found within the answer.
This accounts for all the letters.
This explanation may well be incorrect...
'in' is the link.
Can you help me to learn more?
(Other definitions for conger eel that I've seen before include "Predatory sea creature" , "long haul?" , "one is long in the water" , "swimmer" , "Predatory fish" .)