Crossword Genius

She's a treasure to the master (5)

Ross

I believe the answer is:

gemma

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

'she's' is the definition.
Both the definition and answer are singular nouns.
Maybe there's a link between them I don't understand?

'a treasure to the master' is the wordplay.
'a treasure' becomes 'gem' (gem is a kind of treasure).
'to the master' becomes 'MA' (Master of Arts).
'gem'+'ma'='GEMMA'

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.
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