Leave moggy I love in vehicle (8)
I believe the answer is:
vacation
'leave' is the definition.
(leave from one's job)
'moggy i love in vehicle' is the wordplay.
'moggy' becomes 'cat' (I've seen this before).
'i love' becomes 'io' (I've seen this in other clues).
'in' means one lot of letters goes inside another.
'vehicle' becomes 'van' (van is a kind of vehicle).
'cat'+'io'='catio'
'catio' placed into 'van' is 'VACATION'.
(Other definitions for vacation that I've seen before include "An American holiday" , "break" , "Holiday period" , "Leave" , "Leisure time away from work" .)