Crossword Genius

Relation huffs about possible Congressional result (9)

Ross

I believe the answer is:

stepchild

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'relation' is the definition.
(stepchild is a kind of relation)

I don't understand how the rest of the clue works.

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(Other definitions for stepchild that I've seen before include "Spouse's son or daughter from a previous marriage" , "Offspring of spouse" , "Somebody else's kid" , "Cinderella, perhaps" .)

I've seen this clue in The Independent.
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