Crossword Genius

Shame! Don't believe it (9)

Ross

I believe the answer is:

discredit

I'm a little stuck... Click here to teach me more about this clue!

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

'don't believe it' is the wordplay.
I cannot really see how this works, but
'believe' could be 'credit' (I've seen this before) and 'credit' is located in the answer.
The remaining letters 'dis' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for discredit that I've seen before include "Cast doubt" , "Loss of reputation" , "Smear" , "explode" , "Refuse to believe" .)

I've seen this clue in The Globe and Mail.
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