Crossword Genius

Not straight (7)

Ross

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4

7

5*
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'straight' is the definition.
Both the answer and definition are adjectives. Perhaps there's an association between them I don't understand?

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

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(Other definitions for diluted that I've seen before include "Lessened the strength of a solution" , "reduced in strength" , "Watered down or attenuated." , "Weaker" .)

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