Beelzebub imprisons this slippery character (3)

I believe the answer is:

eel

'this slippery character' is the definition.
(slippery fish)

'beelzebub imprisons' is the wordplay.
'imprisons' indicates a hidden word (I've seen 'imprisoning' mean this (the answer is imprisoned within the clue)).
'EEL' can be found hidden inside 'beelzebub'.

(Other definitions for eel that I've seen before include "Creature like conger or moray" , "Conger, e.g." , "Snakelike fish" , "Slippery figure" , "Ribbon-like fish" .)

I've seen this clue in The Sun.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.