Shopkeeper and master of disguise (9)
I believe the answer is:
tradesman
'shopkeeper' is the definition.
('tradesman' can be a synonym of 'shopkeeper')
'and master of disguise' is the wordplay.
'of disguise' indicates an anagram (I've seen 'disguised' mean this).
'and'+'master'='andmaster'
'andmaster' is an anagram of 'TRADESMAN'.
(Other definitions for tradesman that I've seen before include "Retailer - artisan" , "Business operator" , "Ten dramas for skilled workman" , "Dealer" , "Small-scale businessman" .)