Large group equipped with members, might you say? (4)
I believe the answer is:
army
I believe this is a double definition.
'large group' is the first definition.
(an army of people)
'equipped with members might you say?' is the second definition.
('army' could whimsically mean having arms)
(Other definitions for army that I've seen before include "Throng" , "See 21" , "A defence force" , "Collective term for caterpillars" , "Land-fighting force" .)