Dwell on aspect (6)
I believe the answer is:
reside
'dwell' is the definition.
('reside' can be a synonym of 'dwell')
'on aspect' is the wordplay.
'on' becomes 're' ('on' can be mean 'with reference to').
'aspect' becomes 'side' (side is a kind of aspect**).
're'+'side'='RESIDE'
(Other definitions for reside that I've seen before include "Make one's home permanently" , "Dwell, be present (in)" , "Occupy a place" , "Stay - desire (anag)" , "'Live, dwell (6)'" .)