Crossword Genius

Name for a light-hearted girl? (5)

Ross

I believe the answer is:

gemma

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'name' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'light-hearted girl?' is the wordplay.
'light-hearted' becomes 'g' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'girl?' becomes 'Emma' (girl's name).
'g'+'emma'='GEMMA'

'for a' acts as a link.

Can you help me to learn more?

(Other definitions for gemma that I've seen before include "Girl's name" , "girl" , "Bud" .)

I've seen this clue in the Evening Standard.
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