Crossword Genius

Exchanging parts when announcing exits is more important (9)

Ross

I believe the answer is:

outweighs

'is more important' is the definition.
(to outweigh is to be more important than)

I cannot understand how the rest of the clue works.

(Other definitions for outweighs that I've seen before include "Compensates for" , "tips the balance" , "Has priority over" .)

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