Crossword Genius

Frank is prepared to do business (4)

Ross

I believe the answer is:

open

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'frank' is the definition.
(synonyms)

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(Other definitions for open that I've seen before include "Liberal" , "hardly high-security" , "'Frank, not secret (4)'" , "yawning" , "Overt" .)

I've seen this clue in the Evening Standard.
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