Crossword Genius

Sailors travel here for substantial part of meal (4,6)

Ross

I believe the answer is:

main course

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This could be a double definition.

'sailors travel here' is the first definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'substantial part of meal' is the second definition.
(I've seen this before)

'for' is the link.

Can you help me to learn more?

(Other definitions for main course that I've seen before include "substantial part of meal" , "sailors find trapping a lot of wind" , "Marine biology, perhaps" , "big dish?" , "Series of sailing lessons" .)

I've seen this clue in The Everyman puzzle in The Observer.
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