Vent (6)
'vent' is the definition.
(I've seen this in another clue)
This is the entire 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" .)