Crossword Genius

Weakens certain standards (5)

Ross

I believe the answer is:

flags

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'standards' is the definition.
(I know this)

I can't explain the rest of the clue.

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(Other definitions for flags that I've seen before include "Standards" , "Tires; national symbols" , "Paving stones" , "Droops" , "Declines" .)

I've seen this clue in the Evening Standard.
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