Jolly quiet avoiding buying a round of drinks (6)
I believe the answer is:
outing
'jolly' is the definition.
(both can mean a trip)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for outing that I've seen before include "Revealing orientation" , "Day trip" , "Excursion, trip" , "Expedition" , "A trip in the open air" .)