Crossword Genius

Drop off, however briefly (4)

Ross

I believe the answer is:

doze

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'drop off' is the definition.
(thesaurus)

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

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(Other definitions for doze that I've seen before include "A short light sleep" , "Nod off" , "Take forty winks" , "Snooze" , "Go to sleep" .)

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