Expression of hilarity from female offspring showing different face (8)

I believe the answer is:

laughter

I'm a little stuck... Click here to teach me more about this clue!

'expression of hilarity' is the definition.
'laughter' can be an answer for 'hilarity' (I've seen this before). I'm not certain of the 'expression of' bit.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for laughter that I've seen before include "Manifestation of amusement" , "Hilarity" , "Chuckling" , "end of the comedian" , "Infectious thing" .)

I've seen this clue in The Times.

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