Switch positions intermittently (3,3,2)

I think it could be either:

Which length description are you looking for?:

2,3,3

3,3,2

on and off

This clue is a double definition.

'switch positions' is the first definition.
(I've seen this before)

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

(Other definitions for on and off that I've seen before include "the two sides at Old Trafford?" , "From time to time, not continually" , "Now and then, starting and stopping" , "Perhaps switch positions" , "Intermittently" .)

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

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