Fish found in creels (3)
I believe the answer is:
eel
'fish' is the definition.
(eel is a type of fish)
'in creels' is the wordplay.
'in' indicates the answer is hidden within the clue.
'EEL' is hidden within 'creels'.
'found' is the link.
(Other definitions for eel that I've seen before include "Slimy fish" , "Large elver" , "Moray or electric, for instance" , "Proverbially slippery fish" , "Snakelike fish" .)