Crossword Genius

Might they reignite relationship? (3,6)

Ross

I believe the answer is:

old flames

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

I can't explain the rest of the clue.

Can you help me to learn more?

(Another definition for old flames that I've seen is " Former lovers - hot stuff".)

I've seen this clue in The Sun.
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