Crossword Genius

Lets Sioux ammo change hands twice? (6)

Ross

I believe the answer is:

allows

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'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" .)

I've seen this clue in the Sydney Morning Herald.
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