Presumably, self-catering holidays for those movements that appeal to narcissists (3,5)
I believe the answer is:
ego trips
'narcissists' is the definition.
Although both the answer and definition are plural nouns, I don't understand how they can define each other.
'presumably self-catering holidays for those movements that appeal' is the wordplay.
I cannot quite understand how this works, but
'self' could be 'ego' (synonyms) and 'ego' is found within the answer.
'movements' could be 'trips' (trip is a kind of movement) and 'trips' is present in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'to' is the link.
Can you help me to learn more?
(Other definitions for ego trips that I've seen before include "Personal experiences" , "Exercises in vanity" , "Self-importance boosters" , "Events stage-managed to boost one's image" , "Go, priest on conceited boosts to self-esteem" .)