Conscious of a stir (5)
I believe the answer is:
awake
I believe this is a double definition.
'conscious' is the first definition.
('awake' can be similar in meaning to 'conscious')
'a stir' is the second definition.
(thesaurus)
'of' is the link.
(Other definitions for awake that I've seen before include "Not asleep" , "Conscious, aware" , "No longer in the land of Nod" , "Cease sleeping" , "Conscious and (usually) open-eyed" .)