Gee, what an old-fashioned doll! (5)

I believe the answer is:

golly

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'an old-fashioned doll' is the definition.
The definition suggests a singular noun which matches the answer.

'gee what' is the wordplay.
'gee' becomes 'g' (synonyms).
'what' becomes 'olly' (I can't justify this - if you can you should give a lot more credence to this answer).
'g'+'olly'='GOLLY'

Can you help me to learn more?

(Another definition for golly that I've seen is " Gosh!".)

I've seen this clue in the Evening Standard.

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