Levelled things up between a couple (6)

I believe the answer is:

evened

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'levelled' is the definition.
('even' can be a synonym of 'level')

I cannot understand how the remainder of the clue works.

(Other definitions for evened that I've seen before include "Made level" , "Made smooth and regular" , "Levelled" , "Made smooth or equalised" .)

I've seen this clue in the Evening Standard.

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