Suspend registered retailer (6)
I believe the answer is:
draper
'retailer' is the definition.
(I have seen 'Retailer of fabrics ' mean 'draper' so perhaps 'retailer' could also mean 'draper')
'suspend registered' is the wordplay.
'suspend' becomes 'drape'.
'registered' becomes 'R' (abbreviation, as in registered trademark).
'drape'+'r'='DRAPER'
(Other definitions for draper that I've seen before include "One sells clothes" , "Retailer of cloth" , "He sells fabrics" , "Seller of textiles" , "Seller of cloth" .)