Crossword Genius

I say, what a jolly rhyme! (5)

Ross

I believe the answer is:

golly

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This clue could be a double definition.

'i say' is the first definition.
Both the answer and definition are interjections.
Perhaps there's an association between them I don't understand?

'a jolly rhyme' is the second definition.
The definition suggests a singular noun which matches the answer.

'what' acts as a link.

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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