Crossword Genius

There's a sporting chance it has fishy contents (5)

Ross

I believe the answer is:

creel

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'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" .)

I've seen this clue in the Evening Standard.
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