Current leader of group associated with masterful playing (4,6)
I believe the answer is:
gulf stream
'current' is the definition.
(Gulf stream is an example)
'leader of group associated with masterful playing' is the wordplay.
'leader of' indicates taking the first letters.
'associated with' means one lot of letters go next to another.
'playing' indicates anagramming the letters.
The first letter of 'group' is 'g'.
'masterful' with letters rearranged gives 'ulfstream'.
'g'+'ulfstream'='GULF STREAM'
(Other definitions for gulf stream that I've seen before include "Warm Atlantic current" , "thats currently warming us" , "North Atlantic Drift" .)