Royal answer to amuse (5)

I believe the answer is:

erato

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'royal answer to amuse' is the definition.
I can't tell whether this defines the answer.

'royal answer to' is the wordplay.
'royal' becomes 'er' (abbreviation for Elizabeth Regina).
'answer' becomes 'a' (abbreviation eg in Q and A).
'er'+'a'+'to'='ERATO'

Can you help me to learn more?

(Other definitions for erato that I've seen before include "poetical inspiration" , "Clio's sister" , "Muse of 11 and 23" , "Lyric poetry's muse" , "inspiration for poetry" .)

I've seen this clue in the Sydney Morning Herald.

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