Frank is no fibber (6)

I believe the answer is:

honest

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

I can't explain the rest of the clue.

(Other definitions for honest that I've seen before include "Truthful and dependable" , "Free of deceit, truthful by nature" , "Truthful in manner" , "Free of deceit and lies - truly!" , "'Fair-dealing, upright (6)'" .)

I've seen this clue in the Evening Standard.

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