Waltzers keep this prime title when dancing (6,4)

I believe the answer is:

triple time

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'waltzers keep this' is the definition.
The definition suggests a singular noun which matches the answer.

'prime title when dancing' is the wordplay.
'when dancing' indicates anagramming the letters (I've seen this in other clues).
'prime'+'title'='primetitle'
'primetitle' anagrammed gives 'TRIPLE TIME'.

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(Other definitions for triple time that I've seen before include "What waltzers keep" , "a very high rate of pay in unsocial hours?" .)

I've seen this clue in The Sunday Times.

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