One who makes good dryer introduced by salesman (8)
I believe the answer is:
repairer
'one who makes good' is the definition.
(someone who repairs things)
'dryer introduced by salesman' is the wordplay.
'dryer' becomes 'airer' (device for drying clothes).
'introduced by' says to put letters next to each other.
'salesman' becomes 'rep' (sales representative).
'airer' put after 'rep' is 'REPAIRER'.
(Other definitions for repairer that I've seen before include "Mender, restorer" , "healer" , "Fixer" , "One who mends/fixes" , "One who mends" .)