Vents in shops? (7)
I believe the answer is:
outlets
I believe this clue is a double definition.
'vents' is the first definition.
(I've seen this before)
'shops?' is the second definition.
(shop is a kind of outlet)
'in' is the link.
(Other definitions for outlets that I've seen before include "Retail shops" , "selling places" , "Retail branches" , "Markets for goods or means of giving vent to feelings" , "Sockets; river mouths" .)