Crossword Genius

Female relative, imperious, departs; merriment stifled at first (13)

Ross

I believe the answer is:

granddaughter

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'female relative' is the definition.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for granddaughter that I've seen before include "Relation" , "gives shop-owner's description of Nell Trent" .)

I've seen this clue in The Everyman puzzle in The Observer.
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