Pump, e.g (4)

I believe the answer is:

shoe

(Other definitions for shoe that I've seen before include "Loafer, say" , "Box for holding and dispensing from pack of cards" , "something afoot" , "Trainer, for instance" , "Plate on horse" .)

I've seen this clue in The Washington Post, the King Feature Syndicate, the L.A. Times Daily, the Universal, the Jonesin', The Star Tribune and the Wall Street Journal.

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