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.
(I know that sterling is a type of money)

'exchange for ten girls' is the wordplay.
'ten girls' anagrams to 'STERLING'.
Though, I'm not clear how the anagram 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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