Some professional golf star (5)
I believe the answer is:
algol
'star' is the definition.
(Algol is an example)
'some professional golf' is the wordplay.
'some' indicates the answer is hidden within the clue (some parts of the word are used).
'ALGOL' can be found hidden inside 'professional golf'.
(Other definitions for algol that I've seen before include "language (but not used in speech)" , "Star" , "Computer language" .)