Crossword Genius

Bullish attitude to truth: you are allegedly excluded (3-2)

Ross

I believe the answer is:

can-do

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'bullish' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?

I can't explain the rest of the clue.

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(Other definitions for can-do that I've seen before include "Showing willingness to get the job done" , "Positive-thinking" , "Positive" .)

I've seen this clue in The Guardian.
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