Credit frequently supplying Scottish farm (5)
I believe the answer is:
croft
'scottish farm' is the definition.
(I've seen this before)
'credit frequently' is the wordplay.
'credit' becomes 'cr' (abbreviation).
'frequently' becomes 'oft' (oft can mean frequently, eg oft-quoted).
'cr'+'oft'='CROFT'
'supplying' acts as a link.
(Other definitions for croft that I've seen before include "Small Scottish rented farm" , "Small farm in Scotland" , "Plot" , "Farm up north" , "Scottish smallholding" .)