Possibly having standards lowered? (7)

I believe the answer is:

flagged

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'lowered?' is the definition.
The definition and answer can be both related to change as well as being past participle verbs.
Maybe there's an association between them I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Another definition for flagged that I've seen is " tired".)

I've seen this clue in The Telegraph.

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