Space vacated after journey including a trek (7)
I believe the answer is:
traipse
'trek' is the definition.
(both can mean to walk sluggishly)
'space vacated after journey including a' is the wordplay.
'vacated' says to hollow out the word (remove centre letters).
'after' is a charade indicator (letters next to each other).
'journey' becomes 'trip' (trip is a kind of journey).
'including' is an insertion indicator.
'space' with its centre removed is 'se'.
'trip' enclosing 'a' is 'traip'.
'se' after 'traip' is 'TRAIPSE'.
(Other definitions for traipse that I've seen before include "Trudge around" , "make slow progress" , "laborious walk" , "long tiring walk" , "Tedious walk" .)