Skilful King of France takes time after promotion (6)
I believe the answer is:
adroit
'skilful' is the definition.
(adroit can mean skilful or masterful)
'king of france takes time after promotion' is the wordplay.
'king of france' becomes 'roi' (I've seen this in another clue).
'takes' is a charade indicator (letters next to each other).
'time' becomes 't' (abbreviation).
'after' is a charade indicator (letters next to each other).
'promotion' becomes 'ad' (short for advert).
'roi'+'t' is 'roit'.
'roit' put after 'ad' is 'ADROIT'.
(Other definitions for adroit that I've seen before include "Deft and proficient" , "Nimble and skilful" , "Apt" , "resourceful" , "Quick or skilful" .)