Jolly troops twice quelling trouble like round trip (4-2-4)
I believe the answer is:
door-to-door
'round trip' is the definition.
Both the definition and answer are adjectives. Perhaps there's a link between them I don't understand?
'jolly troops twice quelling trouble' is the wordplay.
I cannot quite see how this works, but
'jolly' could be 'do' (both can mean a party) and 'do' is found within the answer.
'troops' could be 'or' (military abbreviation for other ranks) and 'or' is found in the answer.
This explanation may well be incorrect...
'like' acts as a link.
Can you help me to learn more?
(Another definition for door-to-door that I've seen is " Calling at each house in turn".)