Complete western part of golf course (5)
I believe the answer is:
whole
'complete' is the definition.
(similar in meaning)
'western part of golf course' is the wordplay.
'western' becomes 'w'.
'part of golf course' becomes 'hole' ('hole' is part of 'golf course').
'w'+'hole'='WHOLE'
(Other definitions for whole that I've seen before include "Total" , "All the components" , "undamaged" , "Entire, undivided" , "Complete, containing all the parts" .)