Outlook changes space and time (6)
I believe the answer is:
aspect
'outlook' is the definition.
(I've seen this in another clue)
'changes space and time' is the wordplay.
'changes' indicates anagramming the letters.
'and' says to put letters next to each other.
'time' becomes 't' (abbreviation).
'space' anagrammed gives 'aspec'.
'aspec'+'t'='ASPECT'
(Other definitions for aspect that I've seen before include "Look, panorama" , "Particular feature or quality" , "Angle" , "The way something looks" , "Vista,panorama" .)