Having no object, I've left off travelling (2,7)
I believe the answer is:
in transit
'travelling' is the definition.
'having no object i've left off' is the wordplay.
'having no object' becomes 'intransitive' (grammatical term).
'left off' suggests deleting specific letters.
'intransitive' with 'ive' taken out is 'IN TRANSIT'.
(Other definitions for in transit that I've seen before include "En route" , "during journey" , "On its way" , "while travelling" , "Being transported" .)