Crossword Genius

Garb for the open air will last longer (7)

Ross

I believe the answer is:

outwear

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'last longer' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for outwear that I've seen before include "Exhaust" , "Drain" , "Top dressing" , "ride" , "Last longer than others" .)

I've seen this clue in The Irish News.
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