Purchases made by us (4)
I believe the answer is:
buys
'purchases' is the definition.
('buy' can be a synonym of 'purchase')
'made by us' is the wordplay.
'made' indicates anagramming the letters.
'by'+'us'='byus'
'byus' anagrammed gives 'BUYS'.
(Other definitions for buys that I've seen before include "pays the price" , "Purchases" , "Spends money" .)