"Hmm . . ." (3,2,3)

I think it could be either:

Which length description are you looking for?:

3,2,3

let me see

'hmm' is the definition.
(both can be used to express uncertainty)

This is all the clue.

(Other definitions for let me see that I've seen before include "Showed the setter" , "sit down in front there!" , "I need to think - I want to look" , "Hm" , "I'm thinking - permit me to visualise" .)

I've seen this clue in the Newsday and the USA Today.

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