Club that's suitable for evening out (4)

I believe the answer is:

iron

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'evening out' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

(Other definitions for iron that I've seen before include "Decrease" , "See 14" , "What's used to make pitch" , "Smooth - metal" , "Box-shaped instrument of torture -- no meridian (anag)" .)

I've seen this clue in The Telegraph.

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