Crossword Genius

She's not a day over thirty! (4)

Ross

I believe the answer is:

june

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'she's' is the definition.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for june that I've seen before include "Month of our summer solstice" , "Month named after Jupiter's wife" , "some time" , "Month after 14" , "The "flaming" month?" .)

I've seen this clue in the Evening Standard.
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