Camp site oddly in the style of golf (6)
I believe the answer is:
stalag
'camp' is the definition.
(I've seen this before)
'site oddly in the style of golf' is the wordplay.
'oddly' indicates alternate letters (letters in the odd-numbered positions are used).
'in the style of' becomes 'ala' (I've seen this before).
'golf' becomes 'g' (phonetic alphabet: alpha, bravo, charlie etc.).
The alternate letters of 'site' are 'st'.
'st'+'ala'+'g'='STALAG'
(Other definitions for stalag that I've seen before include "German prison_camp" , "German POW camp in WWII" , "Type of German prison camp" , "German World War two prison camp" , "WWII German prisoner of war camp" .)