Crossword Genius

Old, saucy professional (6)

Ross

I believe the answer is:

expert

'professional' is the definition.
(thesaurus)

'old saucy' is the wordplay.
'old' becomes 'ex' (prefix meaning former or onetime).
'saucy' becomes 'pert' (synonyms).
'ex'+'pert'='EXPERT'

(Other definitions for expert that I've seen before include "Authority" , "Highly skilled or knowledgeable person" , "Pro" , "Specialist, pundit" , "Buff" .)

I've seen this clue in The Mirror.
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