Pretty? I couldn't agree more! (5)

I believe the answer is:

quite

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'pretty?' is the definition.
('quite' can be a synonym of 'pretty')

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

Can you help me to learn more?

(Other definitions for quite that I've seen before include "Completely -- to some extent" , "Rather" , "Somewhat; fully" , "Somewhat - I agree" , "To a degree" .)

I've seen this clue in The Telegraph.

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