Answer: upandup

AnswerCrossword Clue
UPANDUP

On the ... (legit)

UPANDUP

Level?

UPANDUP

On the level.

UPANDUP
On the ... (honest): Slang.
UPANDUP
On the ... (honest).
UPANDUPAboveboard
UPANDUPOn the ...
UPANDUPOn the ... (honest)
UPANDUPLegit (with "on the")