Tiny tunneler (3)

I believe the answer is:

ant

(Other definitions for ant that I've seen before include "Six-footer" , "` `Go to the ... thou sluggard' '" , "Hill-dweller" , "colonist" , "Emmet or pismire" .)

I've seen this clue in The Washington Post, the USA Today, the Newsday.com, The New York Times, the L.A. Times Daily and the Wall Street Journal.

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