Crossword Genius

Brushing off one good impediment to marriage proposal? (8)

Ross

I believe the answer is:

ignoring

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'brushing off' is the definition.
('ignore' can be a synonym of 'brush off')

I don't understand the remainder of the clue.

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(Other definitions for ignoring that I've seen before include "Refusing to acknowledge" , "Paying no attention to" , "Refusing to notice" .)

I've seen this clue in The Times.
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