Jellicle Ball attendee (3)
I believe the answer is:
cat
'jellicle ball attendee' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for cat that I've seen before include "Grimalkin" , "Feline mammel" , "Animal - one with nine tails!" , "Tiger, for instance" , "See 23" .)