Crossword Genius

Settle dispute where currency's up and down? (4)

Ross

I believe the answer is:

toss

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This clue could be a double definition.

'settle dispute' is the first definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps you can see a link between them that I don't see?

'where currency's up and down?' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

Can you help me to learn more?

(Other definitions for toss that I've seen before include "Throw lightly and casually" , "ball" , "when ship does this?" , "Chuck" , "Throw tt" .)

I've seen this clue in The Sun.
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