Crossword Genius

Posh school transforming its fourth famous actress (6)

Ross

I believe the answer is:

harlow

'famous actress' is the definition.
(Jean Harlow)

I don't understand how the remainder of the clue works.

(Other definitions for harlow that I've seen before include "Essex town - American film actress, d. 1937" , "place in Essex" , "Essex girl?" , "Blonde bombshell" , "FILMSTAR" .)

I've seen this clue in The Times.
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