Crossword Genius

Earnings do not begin for a long time (4)

Ross

I believe the answer is:

ages

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

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for ages that I've seen before include "Times" , "Grows old like sage" , "Gets older" , "Donkey's years" , "Aeons" .)

I've seen this clue in The Globe and Mail.
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