Feature alteration to space and time (6)
I believe the answer is:
aspect
'feature' is the definition.
(feature can mean a quality or aspect of something)
'alteration to space and time' is the wordplay.
'alteration to' indicates an anagram (the order of letters is altered).
'and' is a charade indicator (letters next to each other).
'time' becomes 't' (abbreviation).
'space' with letters rearranged gives 'aspec'.
'aspec'+'t'='ASPECT'
(Other definitions for aspect that I've seen before include "The way something looks" , "Angle" , "Manner" , "Viewpoint or view" , "Vista,panorama" .)