Splendid person, solitary type with no end of skill (4)
I believe the answer is:
oner
'splendid person' is the definition.
(oner can mean a remarkable individual)
I don't understand the remainder of the clue.
(Other definitions for oner that I've seen before include "remarkable person" , "Hit" , "Remarkable thing" , "Unique person" , "A pound coin" .)