Trouble getting a vehicle put in reverse (4,2)
I believe the answer is:
bust up
'trouble' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
'getting a vehicle put in reverse' is the wordplay.
'getting' says to put letters next to each other.
'a vehicle' becomes 'sub' (sub is a kind of vehicle).
'in reverse' says the letters should be written backwards.
'sub' after 'put' is 'putsub'.
'putsub' in reverse letter order is 'BUST-UP'.
Can you help me to learn more?
(Other definitions for bust up that I've seen before include "quarrel!" , "Bra-destroying feminist presumably wouldn't have this" , "fight" , "disturbance" .)