Perhaps travel in time (8)
I believe the answer is:
interval
'time' is the definition.
(thesaurus)
'perhaps travel in' is the wordplay.
'perhaps' is an anagram indicator.
'travel'+'in'='travelin'
'travelin' anagrammed gives 'INTERVAL'.
(Other definitions for interval that I've seen before include "Pause (between acts)" , "Space of time" , "Gap during performance" , "in which cast rests?" , "Intervening time" .)