Lets Sioux ammo change hands twice? (6)
I believe the answer is:
allows
'lets' is the definition.
('allow' can be a synonym of 'let')
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for allows that I've seen before include "Grants leave" , "Tolerates" , "Sallow (anag.)" , "Permits to do something" , "Permits, lets" .)