Skilled, accomplished (6)
I believe the answer is:
expert
This clue is a double definition.
'skilled' is the first definition.
(similar in meaning)
'accomplished' is the second definition.
(synonyms)
(Other definitions for expert that I've seen before include "At the right moment" , "Adept" , "Skilled workman or specialist" , "Specialist, pundit" , "Proficient and skilful" .)