Vibration caused by roller in good condition? (5,4)

I believe the answer is:

sound wave

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'vibration' is the definition.
(vibration of sound)

'by roller in good condition?' is the wordplay.
'by' is a charade indicator (letters next to each other).
'roller' becomes 'wave' (I've seen this in another clue).
'in good condition?' becomes 'sound' (I've seen this in another clue).
'wave' put after 'sound' is 'SOUND-WAVE'.

'caused' acts as a link.
This may not be right. It may be part of another bit of the clue.

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I've seen this clue in The Times.

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