Side with one another (6)

I believe the answer is:

eleven

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

I can't explain the rest of the clue.

(Other definitions for eleven that I've seen before include "Time for the mid-morning tea break?" , "XI as Roman numeral" , "Cricketing side" , "Time for morning coffee" , "Number killed in the Peterloo massacre" .)

I've seen this clue in the Evening Standard.

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