Angle affects space and time (6)
I believe the answer is:
aspect
'angle' is the definition.
(I've seen this in another clue)
'affects space and time' is the wordplay.
'affects' indicates an anagram (I've seen 'affecting' mean this).
'and' says to put 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 appearance presented" , "The way something looks" , "particular view" , "Particular part or feature of something" , "Prospect, facet" .)