Leave priest cavorting outside in selfish activities (3,5)
I believe the answer is:
ego trips
'selfish activities' is the definition.
The answer and definition can be both acts as well as being plural nouns.
Maybe you can see a link between them that I can't see?
'leave priest cavorting outside' is the wordplay.
'leave' becomes 'go' (to go is to depart or leave).
'cavorting' indicates an anagram.
'outside' means one lot of letters goes inside another (some letters go outside others).
'priest' anagrammed gives 'etrips'.
'go' placed inside 'etrips' is 'EGO-TRIPS'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for ego trips that I've seen before include "Events stage-managed to boost one's image" , "Personal experiences" , "self-indulgent activities" , "delusions of grandeur!" , "vanity projects" .)