"Well, darn!” (3)

I think it could be either:

Which length description are you looking for?:

gee

(Other definitions for gee that I've seen before include "Word of encouragement to a horse" , "Urge horse - expression of surprise" , "American exclamation" , "Gracious" , "crumbs" .)

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

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