Crossword Genius

One born in Hollywood? (4)

Ross

I believe the answer is:

star

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'hollywood?' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

'one born in' is the wordplay.
'one' becomes 'a' (a thing is one thing).
'born' becomes 'str' (I can't explain this - if you can you should believe this answer much more).
'in' indicates putting letters inside.
'a' inserted within 'str' is 'STAR'.

Can you help me to learn more?

(Other definitions for star that I've seen before include "Lead actor" , "Famous performer" , "Leading character" , "personality?" , "Astronomer - dreamer" .)

I've seen this clue in the Evening Standard.
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