Party for women as gentleman heads out (3,5)

I believe the answer is:

hen night

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

I cannot understand how the rest of the clue works.

(Other definitions for hen night that I've seen before include "then may the ladies rejoice" , "Party for women only" , "Bridal celebration" , "Bride's celebration before wedding" , "Amusing the girls, bash" .)

I've seen this clue in The Hindu.

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