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May be a run before a wash — one’s fully aware (4,5)

Ross

I believe the answer is:

wide awake

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'aware' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

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(Other definitions for wide awake that I've seen before include "on the ball" , "Felt hat" , "unlikely to drop off?" .)

I've seen this clue in The Hindu.
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