Crossword Genius

Frank is in US brothel? (6)

Ross

I believe the answer is:

honest

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'frank' is the definition.
(similar in meaning)

I don't understand the remainder of the clue.

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(Other definitions for honest that I've seen before include "Honourable, true" , "Sincere, upright" , "Genuine; fair" , "Truthful and dependable" , "Free of deceit and lies - truly!" .)

I've seen this clue in The Independent.
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