Space travel in novel (8)
I believe the answer is:
interval
'space' is the definition.
(thesaurus)
'travel in novel' is the wordplay.
'novel' indicates an anagram.
'travel'+'in'='travelin'
'travelin' with letters rearranged gives 'INTERVAL'.
(Other definitions for interval that I've seen before include "Break, gap" , "Space of time" , "Time break as in play production" , "what's between notes?" , "Time between two events" .)