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It's just Frank? (2,3,5)

Ross

I believe the answer is:

on the level

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'frank?' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for on the level that I've seen before include "Fair; honestly speaking" , "Some horse racing is" , "Honest - genuine" , "No tipping" , "Honest, truthful (colloq.)" .)

I've seen this clue in the Irish Times.
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