One, some, every or all (3)
I believe the answer is:
any
This clue is a double definition.
'one some every' is the first definition.
(every member can be any of them)
'all' is the second definition.
(similar in meaning)
(Other definitions for any that I've seen before include "A lot < ? Not a lot < -- some" , "One, some, every or all without specification" , "One or some, whichever you choose" , "Several" , "Some; none in particular" .)