Service has seller put out (6)
I believe the answer is:
repair
'service' is the definition.
(I've seen this in another clue)
'seller put out' is the wordplay.
'seller' becomes 'rep' (sales rep).
'put out' becomes 'air' (both can mean to broadcast).
'rep'+'air'='REPAIR'
'has' acts as a link.
(Other definitions for repair that I've seen before include "Once, return" , "Restore after damage" , "Restore, set right" , "Restore to working condition" , "retire" .)