Crossword Genius

A girl mentioned with regret (4)

Ross

I believe the answer is:

alas

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'a girl mentioned with regret' is the definition.
I can't judge whether this definition defines the answer.

'a girl mentioned' is the wordplay.
'girl' becomes 'lass' (lass can informally mean a girl).
'mentioned' indicates a 'sounds like' (homophone) clue.
'lass' sounds like 'las'.
'a'+'las'='ALAS'

Can you help me to learn more?

(Other definitions for alas that I've seen before include "Sad to say!" , "What a shame!" , "Exclamation of grief" , "Exclamation of misfortune" , "Archaic exclamation of sorrow or regret" .)

I've seen this clue in the Evening Standard.
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