Vent (6)
'vent' is the definition.
(I know that vent can be written as outlet)
This is all the clue.
(Other definitions for outlet that I've seen before include "Opening permitting release" , "Shop selling from a particular producer" , "Maths relationship" , "Shop (retail)" , "Occasion for venting one's feelings" .)
'vent' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for aperture that I've seen before include "Opening, mostly small" , "Opening, gap" , "Opening through which light enters a camera" , "Device controlling amount of light admitted" , "Crack" .)