Crossword Genius

"I'm at a loss” (5)

Ross

I believe the answer is:

dunno

'i'm at a loss' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for dunno that I've seen before include "Informally, pass" , "No idea (informal)" , "I'm in the dark" , "I've no idea!" , "It beats me" .)

I've seen this clue in The Wall Street Journal.
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