"Sure do!" (3)

I think it could be either:

yep

yes

'sure do' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for yep that I've seen before include "Affirmative (US colloq.)" , "informal approval" , "Positive reaction" , "Correct" .)

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

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