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Periodic doof-doof fan donating sample (3,3,2)

Ross

I believe the answer is:

off and on

I'm a little stuck... Click here to teach me more about this clue!

'periodic doof-doof fan donating sample' is the definition.
I can't judge whether this definition defines the answer.

'doof fan donating sample' is the wordplay.
'sample' indicates a hidden word (I've seen 'sampled' mean this (I've seen this in other clues)).
'OFF-AND-ON' is hidden in the letters of 'doof fan donating'.

Can you help me to learn more?

(Other definitions for off and on that I've seen before include "sometimes" , "From time to time" , "the two sides at the Oval are this" , "Intermittent" , "Now and then, here and there (3, 3, 2)" .)

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