Part of a larger group (6)
I believe the answer is:
subset
'part of a larger group' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for subset that I've seen before include "Not all the members" , "Group of which all the elements are contained in a larger group" , "small class?" , "A collection of things forming part of a larger collection" , "Group within a group" .)