Quickly, list some conger eel offcuts (4,3)
I believe the answer is:
reel off
'quickly list' is the definition.
'some conger eel offcuts' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'REEL OFF' can be found hidden inside 'conger eel offcuts'.
(Other definitions for reel off that I've seen before include "run through quickly?" , "Rapidly announce" , "Effortlessly recite" , "Speak very rapidly" , "Utter (something) rapidly and fluently" .)