These go with shirts -- clobber on golf course (4,5)
I believe the answer is:
cuff links
'these go with shirts' is the definition.
(cuff links are worn on shirt cuffs)
'clobber on golf course' is the wordplay.
'clobber' becomes 'cuff' (both can mean to hit).
'on' says to put letters next to each other.
'golf course' becomes 'links' (synonyms).
'cuff'+'links'='CUFF LINKS'
(Other definitions for cuff links that I've seen before include "Accessories" , "They are used on the ends of sleeves" .)