Flagged police dog steps in (10)

I believe the answer is:

signposted

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'flagged' is the definition.
The answer and definition can be both to do with communicating as well as being past participle verbs.
Perhaps you can see an association between them that I don't see?

'police dog steps in' is the wordplay.
'police' indicates anagramming the letters (police can mean to control or manage).
'dog'+'steps'+'in'='dogstepsin'
'dogstepsin' with letters rearranged gives 'SIGNPOSTED'.

Can you help me to learn more?

(Another definition for signposted that I've seen is " Clearly indicated".)

I've seen this clue in The Telegraph.

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