Third of the Greek Muses, alphabetically (5)

I believe the answer is:

erato

(Other definitions for erato that I've seen before include "Greek muse of lyric and love poetry" , "Poetic Muse ; eighteen (anag.)" , "inspiration for poetry" , "Clio's sister" , "Muse of lyric poetry and mime" .)

I've seen this clue in The Sunday Times and The Times.

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