Crossword Genius

County suit under discussion (5)

Ross

I believe the answer is:

herts

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'county' is the definition.
(short for Hertfordshire)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for herts that I've seen is " Watford's county (abbr)".)

I've seen this clue in The Telegraph.
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