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After thirty, she's finished! (5)

Ross

I believe the answer is:

april

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'after thirty' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for april that I've seen before include "on her first kid" , "4th month" , "Month of showers and of the Queen's birthday" , "Start of the financial year" , "Part of spring" .)

I've seen this clue in the Evening Standard.
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