Western part of golf course is complete (5)
I believe the answer is:
whole
'is 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 "Integral" , "Complete, containing all the parts" , "Total" , "In entirety" , "All the components" .)