There's a sporting chance it has fishy contents (5)
I believe the answer is:
creel
'contents' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for creel that I've seen before include "Angler's wicker basket" , "Basket to hold fish" , "Wicker basket for fish" , "Large fishing basket" , "Lobster pot" .)