Crossword Genius

Quashes charge brought by new partner (7)

Ross

I believe the answer is:

stepson

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

'partner' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?

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

Can you help me to learn more?

(Other definitions for stepson that I've seen before include "Spouse's child from previous marriage" , "Child of a spouse by a former marriage" , "Child from a spouse's former marriage" , "younger member of family" , "could be issue for partner" .)

I've seen this clue in The Independent.
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