Crossword Genius

Cosmetic treatment transforming pert and saucy girls (7,7)

Ross

I believe the answer is:

plastic surgery

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

'cosmetic treatment' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'transforming pert and saucy girls' is the wordplay.
'transforming' indicates an anagram (I've seen this in other clues).
'and' is a charade indicator (letters next to each other).
'saucy'+'girls'='saucygirls'
'pert' put after 'saucygirls' is 'saucygirlspert'.
'saucygirlspert' anagrammed gives 'PLASTIC SURGERY'.

Can you help me to learn more?

(Other definitions for plastic surgery that I've seen before include "Bodily reconstruction" , "certain operations" .)

I've seen this clue in The Times.
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