Crossword Genius

Why more felt upset about a migrant vessel? (3,9)

Ross

I believe the answer is:

the mayflower

I'm a little stuck... Click here to teach me more about this clue!

'why more felt upset about a migrant' is the definition.
I can't tell whether this definition defines the answer.

'vessel?' is the wordplay.
I cannot really understand how this works, but
'vessel?' could be 'mayflower' (I have seen 'Famous vessel' mean 'mayflower' so perhaps 'vessel' could also mean 'mayflower') and 'mayflower' is located in the answer.
The remaining letters 'the' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Sunday Times.
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