Haul of southwest silver? (4)
I believe the answer is:
swag
'haul' is the definition.
(thesaurus)
'southwest silver?' is the wordplay.
'southwest' becomes 'sw' ('SW' can be a synonym of 'southwest').
'silver?' becomes 'ag' (Ag is the chemical symbol for silver).
'sw'+'ag'='SWAG'
'of' acts as a link.
(Other definitions for swag that I've seen before include "Loop of drapery" , "What the burglar took" , "stuff stolen" , "goods from burglary" , "Goods taken by burglar" .)