Spooner's to be bold enough to divulge honest transaction (6,4)

I believe the answer is:

square deal

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'transaction' is the definition.
(I have seen 'Fair transaction ' mean 'square deal' so perhaps 'transaction' could also mean 'square deal')

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for square deal that I've seen before include "fair treatment" , "Fair transaction" , "Fair trade" .)

I've seen this clue in The Everyman puzzle in The Observer.

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