Does she hearten Rosalie? (3)

I believe the answer is:

sal

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'does she' is the definition.
'Sal' can be an answer for 'she'. I am not certain of the 'does' bit.

'hearten rosalie?' is the wordplay.
'SAL' is hidden within the letters.
However, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for sal that I've seen before include "- - volatile" , "Sarah (dim.)" , "girl?" .)

I've seen this clue in the Evening Standard.

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