Crossword Genius

Quarrel about river fish (5)

Ross

I believe the answer is:

sprat

I'm a little stuck... Click here to teach me more about this clue!

This could be a double definition.

'quarrel about river' is the first definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'fish' is the second definition.
(I know that sprat is a type of forage fish)

Can you help me to learn more?

(Other definitions for sprat that I've seen before include "chap giving richer course material to the Dutch" , "Traps for small fish" , "chap on a fat-free diet" , "Mackerel bait?" , "Parts of a very small fish" .)

I've seen this clue in The Daily Express and The Telegraph.
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