Frank inside with one staffer (6)

I believe the answer is:

honest

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

'inside with one staffer' is the wordplay.
'inside' indicates the answer is hidden within the clue.
'HONEST' can be found hidden inside 'with one staffer'.

(Other definitions for honest that I've seen before include "Trustworthy or candid" , "Law-abiding" , "Fair and square" , "Honorable, true" , "Objective mediator" .)

I've seen this clue in The Sun.

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