Crossword Genius

Staff’s beginning to remove someone not wanted on board (8)

Ross

I believe the answer is:

stowaway

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

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

'staff's beginning to remove someone' is the wordplay.
I cannot really understand how this works, but
'to' is found in the answer.
This explanation may well be incorrect...

'not' acts as a link.

Can you help me to learn more?

(Other definitions for stowaway that I've seen before include "One illegally on board" , "Illegal traveller" , "Free rider" , "Person who hides on ship to avoid paying fare" , "Unauthorised passenger" .)

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