Where cars refuel containers fall over (3,4)
I believe the answer is:
pit stop
'where cars refuel' is the definition.
I know nothing about this answer so I can't tell whether this works.
'containers fall over' is the wordplay.
'containers' becomes 'pots' (pot is a kind of container).
'fall' becomes 'tip'.
'over' says the letters should be written in reverse.
'pots'+'tip'='potstip'
'potstip' back-to-front is 'PIT STOP'.
Can you help me to learn more?
(Other definitions for pit stop that I've seen before include "brief service" , "F1 race feature" , "Break for refuelling" , "part of the race" , "Break for fuel etc." .)