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Watchman who sticks to the rules? (8)


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'watchman who sticks to the rules?' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe there's an association between them I don't understand?

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(Other definitions for observer that I've seen before include "One watching, evaluating" , "Spectator - or another weekly publication!" , "I notice" , "Looker-on" , "One watching attentively" .)

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