Crossword Genius

Don't go for a decent run! (6)


I believe the answer is:


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'run' is the definition.
(I know that run can be written as streak)

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

Can you help me to learn more?

(Other definitions for streak that I've seen before include "irregular line of colour" , "'Sudden flash, of lightning say (6)'" , "run risk of arrest at sporting event?" , "exposz" , "Unbroken series, of luck say" .)

I've seen this clue in the Evening Standard.
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