They may be found in a creel squirming (4)
I believe the answer is:
'they' is the definition.
Both the answer and definition are plural nouns.
Maybe there's a link between them I don't understand?
'found in a creel squirming' is the wordplay.
'found in' indicates a hidden word.
'EELS' is hidden within 'creel squirming'.
'may be' is the link.
Can you help me to learn more?
(Other definitions for eels that I've seen before include "Fish (that may be jellied)" , "Jellied --, traditional dish" , "Slippery types" , "Long, fleshy fish" , "Elongated fish" .)