Crossword Genius

A girl superstar full of sex appeal (5)

Ross

I believe the answer is:

susan

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'a girl' is the definition.
(I've seen this before)

'superstar full of sex appeal' is the wordplay.
'superstar' becomes 'sun' (I can't justify this - if you can you should believe this answer much more).
'full of' is an insertion indicator.
'sex appeal' becomes 'SA' (old-fashioned abbreviation).
'sun' enclosing 'sa' is 'SUSAN'.

Can you help me to learn more?

(Other definitions for susan that I've seen before include "When lazy, she's a revolving tray on a dining table" , "with blooming black eye?" , "Girl's name, meaning lily" , "Server at table's no lazy" , "Girl's name; lazy -" .)

I've seen this clue in The Globe and Mail.
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