Does it provide representatives in all quarters? (10)

I believe the answer is:

newsagency

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'representatives in all quarters?' is the definition.
The definition suggests a singular noun which matches the answer.

'does it' is the wordplay.
I cannot really see how this works, but
'it' could be 'sa' (old-fashioned abbreviation for sex appeal) and 'sa' is located in the answer.
This explanation may well be incorrect...

'provide' acts as a link.

Can you help me to learn more?

I've seen this clue in The Irish News.

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