At least one (3)
I believe the answer is:
'at least one' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for any that I've seen before include "One or some, whichever you choose" , "A lot < ? Not a lot < -- some" , "'Whatever'" , "Long-running Radio 4 discussion show" , "One, some, every or all without specification" .)