Crossword Genius

Harlots exposed by English king's heralds (10)

Ross

I believe the answer is:

trumpeters

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

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Another definition for trumpeters that I've seen is " musicians".)

I've seen this clue in The Independent.
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