Smooth out (4)

I think it could be either:

even

iron

'smooth out' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for even that I've seen before include "Not easily annoyed" , "Not odd; flat" , "Pantomime" , "Describes a number divisible by two" , "Short joke" .)

I've seen this clue in The Times, The New York Times, the Newsday.com, the Newsday, the Universal and the L.A. Times Daily.

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