Crossword Genius

Firm in time makes money (7)

Ross

I believe the answer is:

coinage

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

'money' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for coinage that I've seen before include "Fresh bit of language" , "in notes? No" , "Metal currency" , "Royal Mint's output" , "for the new term" .)

I've seen this clue in The Sun and The Times.
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