Committee type (2,3)
I believe the answer is:
ad hoc
'committee type' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ad hoc that I've seen before include "(Of committee) formed for a single purpose" , "Applied to a particular situation" , "(Created) for particular purpose" , "not in general practice" , "Devised for one particular occasion" .)