She cackles in the night (3)

I believe the answer is:

hen

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'she cackles in the night' is the definition.
I can't tell whether this definition defines the answer.

'in the night' is the wordplay.
'in' indicates a hidden word.
'HEN' is hidden within 'the night'.

Can you help me to learn more?

(Other definitions for hen that I've seen before include "Not cock" , "Insufficient in amount" , "Domestic egg layer" , "Composed of women" , "Source of eggs" .)

I've seen this clue in the Evening Standard.

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