Wedge, e.g. (4)

I think it could be either:

shoe

iron

(Other definitions for shoe that I've seen before include "this goes about a foot" , "Sandal, for instance" , "From which playing cards are dealt one at a time" , "What's worn" , "Oxford, say" .)

I've seen this clue in The New York Times, The Wall Street Journal, The Washington Post and The Washington Post Sunday.

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