Crossword Genius

The average woman's secret? (3)

Ross

I believe the answer is:

age

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

'woman's secret?' is the definition.
(I've seen this in another clue)

'the average' is the wordplay.
'AGE' is hidden in amongst the letters.
But, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for age that I've seen before include "it improves wine" , "Period of time" , "Period of history" , "Period piece" , "Very long time" .)

I've seen this clue in the Evening Standard.
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