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What held up Greek fleet en route to Troy? (6,3)

Ross

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6

6,3

aegean sea

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

I don't understand the remainder of the clue.

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(Other definitions for aegean sea that I've seen before include "Where 11 [GREEK] swims" , "Main" , "Stretch of water between Turkey and Greece" , "Where the Isles of Greece are" , "Area around Greece" .)

I've seen this clue in The Independent and The Telegraph.
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