Crossword Genius

Release the mildly erroneous three (4)

Ross

I believe the answer is:

free

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'release' is the definition.
(synonyms)

I can't explain the remainder of the clue.

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(Other definitions for free that I've seen before include "Costing nothing" , "Exempt" , "Not occupied; release" , "Unfettered" , "Untrammelled" .)

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