Space travel in chaos (8)
I believe the answer is:
interval
'space' is the definition.
(both can mean a gap)
'travel in chaos' is the wordplay.
'chaos' indicates anagramming the letters.
'travel'+'in'='travelin'
'travelin' with letters rearranged gives 'INTERVAL'.
(Other definitions for interval that I've seen before include "Pause (between acts)" , "Intervening time" , "Intermission, during a play say" , "Pause in middle of performance" , "Hiatus" .)