Crossword Genius

Tories’ lying has extraordinary scale: that’s what they do (4,10)

Ross

I believe the answer is:

oral hygienists

'scale that's what they do' is the definition.
(oral hygienists might scale teeth)

'tories' lying has extraordinary' is the wordplay.
'extraordinary' indicates anagramming the letters.
'tories'+'lying'+'has'='torieslyinghas'
'torieslyinghas' anagrammed gives 'ORAL HYGIENISTS'.

I've seen this clue in The Guardian.
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