An American taking in golf in Scottish region (5)
I believe the answer is:
angus
'scottish region' is the definition.
(area of Scotland)
'an american taking in golf' is the wordplay.
'american' becomes 'us' (abbreviation for United States).
'taking in' indicates putting letters inside.
'golf' becomes 'g' (phonetic alphabet: alpha, bravo, charlie etc.).
'an'+'us'='anus'
'anus' placed around 'g' is 'ANGUS'.
'in' acts as a link.
(Other definitions for angus that I've seen before include "man" , "Steer" , "A snug breed from Aberdeen" , "Scot" , "Scotsman" .)