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What dictionaries do about it is quite clear (8)

Ross

I believe the answer is:

definite

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'clear' is the definition.
(associated in meaning)

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(Other definitions for definite that I've seen before include "Positive, certain" , "Certain, decisive" , "- - 7" , "Unmistakable" , "Sure, positive" .)

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