Frank guide (6)

I believe the answer is:

direct

I believe this clue is a double definition.

'frank' is the first definition.
(I've seen this before)

'guide' is the second definition.
('direct' can be a synonym of 'guide')

(Other definitions for direct that I've seen before include "'Straight, without deviation (6)'" , "the shortest way" , "Candid" , "Give travel guidance" , "Regulate" .)

I've seen this clue in The Guardian.

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