Skilful band or society regularly appearing (6)
I believe the answer is:
adroit
'skilful' is the definition.
(adroit can mean skilful or masterful)
'band or society regularly appearing' is the wordplay.
'regularly appearing' indicates alternate letters.
'band'+'or'+'society'='bandorsociety'
The alternating letters of 'bandorsociety' are 'ADROIT'.
(Other definitions for adroit that I've seen before include "Skilful or ingenious" , "Quick and clever in action or thought" , "To raid (anag)" , "handy" , "Deft and proficient" .)