Joke about women's relatives looking hard (7)

I believe the answer is:

gawking

'looking hard' is the definition.

'joke about women's relatives' is the wordplay.
'joke' becomes 'gag' (gagging is a kind of joking).
'about' means one lot of letters goes inside another.
'women' becomes 'w'.
'relatives' becomes 'kin' (I've seen this before).
'w'+'kin'='wkin'
'gag' going around 'wkin' is 'GAWKING'.

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