Crossword Genius

Currency exchange for ten girls (8)

Ross

I believe the answer is:

sterling

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

'currency' is the definition.
(sterling is a kind of currency)

'exchange for ten girls' is the wordplay.
'ten girls' can be anagrammed to 'STERLING'.
Though, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for sterling that I've seen before include "first-class quality" , "banking standard" , "UK money" , "Genuine - money" , "Of the highest qualiy" .)

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