Famous girl with Romeo (7)

I believe the answer is:

stellar

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'famous girl with romeo' is the definition.
I can't judge whether this defines the answer.

'famous girl with romeo' is the wordplay.
'famous' becomes 'st' (I can't justify this - if you can you should give a lot more credence to this answer).
'girl' becomes 'Ella' (girl's name).
'with' means one lot of letters go next to another.
'romeo' becomes 'R' (phonetic alphabet: alpha, bravo, charlie etc.).
'st'+'ella'+'r'='STELLAR'

Can you help me to learn more?

(Other definitions for stellar that I've seen before include "Relating to the stars" , "Like highlights" , "Exceptionally good" , "characteristic of The Sun, etc" , "Outstanding -- star-like" .)

I've seen this clue in The Sun.

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