She isn’t so saintly as Stella (4)

I believe the answer is:

ella

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

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

'isn't so saintly as stella' is the wordplay.
'ELLA' is hidden within the letters.
But, I'm not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for ella that I've seen before include "Diminutive of Eleanor" , "Miss" , "---- Fitzgerald, 'Queen of Jazz'" , ".... Fitzgerald, late great jazz diva" , "- Wheeler Wilcox, US poet" .)

I've seen this clue in the Evening Standard.

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