Full meeting in place, menu to be worked out (6)
I believe the answer is:
plenum
'full meeting' is the definition.
(meeting including all members of a group)
'place menu to be worked out' is the wordplay.
'place' becomes 'pl' (I've seen this in other clues).
'to be worked out' is an anagram indicator.
'menu' is an anagram of 'enum'.
'pl'+'enum'='PLENUM'
'in' acts as a link.
(Other definitions for plenum that I've seen before include "Space filled with matter, as opposed to a vacuum" , "completely filled space" , "group meeting" , "Meeting of whole body" , "Full meeting of body" .)