Parisian in purple trousers meeting with everyone (6)
I believe the answer is:
plenum
'meeting with everyone' is the definition.
I can't tell whether this defines the answer.
'parisian in purple trousers' is the wordplay.
'parisian in' becomes 'en' (I've seen this in other clues).
'purple' becomes 'plum' (I have seen 'Dark purple' mean 'plum' so perhaps 'purple' could also mean 'plum').
'trousers' means one lot of letters goes inside another (trouser can mean to steal or take).
'en' going into 'plum' is 'PLENUM'.
Can you help me to learn more?
(Other definitions for plenum that I've seen before include "Full meeting of body" , "Space filled with matter, as opposed to a vacuum" , "group meeting" , "completely filled space" , "Fully attended meeting" .)