Crossword Genius

So-and-so born on boat (8)

Ross

I believe the answer is:

blighter

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

This clue might be a double definition.

'so-and-so' is the first definition.
(I've seen this before)

'born on boat' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

Can you help me to learn more?

(Other definitions for blighter that I've seen before include "irritating person" , "Beggar" , "(Wretched) fellow" , "irritating guy" , "Villain" .)

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