Crossword Genius

Celebrity policemen are on to sailor (9)

Ross

I believe the answer is:

superstar

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

'celebrity' is the definition.
(I know that superstar is a type of star)

'policemen are on to sailor' is the wordplay.
'policemen are' becomes 'supers' (I can't explain this - if you can you should believe this answer much more).
'on' is a charade indicator (letters next to each other).
'to sailor' becomes 'tar' (slang term for a sailor).
'supers'+'tar'='SUPERSTAR'

Can you help me to learn more?

(Other definitions for superstar that I've seen before include "Dazzling virtuoso" , "Celeb" , "top celebrity" , "Very famous person" , "Dazzling genius" .)

I've seen this clue in The Daily Express.
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