Crossword Genius

Are they still living together? (9)

Ross

I believe the answer is:

flatmates

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'are they' is the definition.
The definition suggests a plural noun which matches the answer.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Another definition for flatmates that I've seen is " Home sharers".)

I've seen this clue in The Sunday Times, The Telegraph and The Times.
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