Turn idly on the back seat and have a wee (7)

I believe the answer is:

twiddle

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'turn' is the definition.
(I know that twiddle is a type of turn)

I don't understand the remainder of the clue.

(Other definitions for twiddle that I've seen before include "Play idly (with something)" , "Play with and twist around" , "Twirl and fiddle" , "Idly rotate (one's thumbs?)" , "Finger idly" .)

I've seen this clue in the Sydney Morning Herald.

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