Crossword Genius

Allow to go for nothing (4)

Ross

I believe the answer is:

free

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'for nothing' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for free that I've seen before include "Reef (anag.)" , "Under no obligation" , "unlike battery hens" , "Available - for love" , "Untie" .)

I've seen this clue in The Globe and Mail.
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