King touring desert in chopper (7)
I believe the answer is:
cleaver
'chopper' is the definition.
(a cleaver chops things)
'king touring desert' is the wordplay.
'king' becomes 'CR' (short for Carolus Rex, King Charles in Latin).
'touring' indicates putting letters inside (touring can mean going round).
'desert' becomes 'leave' (desert can mean to leave or abandon).
'cr' going around 'leave' is 'CLEAVER'.
'in' acts as a link.
(Other definitions for cleaver that I've seen before include "(Meat) chopper" , "A butcher's chopping tool" , "dangerous object?" , "Butcher's knife" , "A butcher may use it" .)