Current leader of group associated with masterful playing (4,6)
I believe the answer is:
Here is my best explanation:
'current' is the definition.
(Gulf stream is an example)
'leader of group associated with masterful playing' is the subsidiary indication.
'leader of' says to take the initial letters.
'associated with' is a charade indicator (letters next to each other).
'playing' indicates anagramming the letters.
The first letter of 'group' is 'g'.
'masterful' is an anagram of 'ulfstream'.
(Other definitions for gulf stream that I've seen before include "North Atlantic Drift" and "Warm Atlantic current".)