Some amount of (3)
I believe the answer is:
any
'some amount of' 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, no matter which" , "A lot < ? Not a lot < -- some" , "One, some, every or all without specification" , "Several" , "One (unspecified)" .)