Two cricket sides, sometimes (3,3,2)

I believe the answer is:

off and on

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

I can't explain the rest of the clue.

(Other definitions for off and on that I've seen before include "Intermittently" , "the two sides at the Oval are this" , "Occasionally" , "Switch options" , "From time to time" .)

I've seen this clue in The Times and The Sunday Times.

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