Upper-class shop, perhaps (4)
I believe the answer is:
posh
'upper-class' is the definition.
(I've seen this before)
'shop perhaps' is the wordplay.
'perhaps' indicates an anagram.
'shop' with letters rearranged gives 'POSH'.
(Other definitions for posh that I've seen before include "Stylishly luxurious" , "Shop (anag.)" , "Elegant and fashionable" , "Aristocratic" , "Elegantly luxurious" .)