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What held up Greek fleet en route to Troy? (6)

Ross

I think it could be either:

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6

6,3
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'troy?' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for aegean that I've seen before include "'Gee, Ana is all at sea (6)'" , "Part of the Mediterranean Sea" , "Greek-Turkish sea" , "Sea, an arm of the Mediterranean" , "Sea around Lesbos" .)

I've seen this clue in The Sun.
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