Possible Clues:

• Poetess from South Africa measures the acidity in the water
• Greek poetess; has pop (anag.)
• Greek poetess has curiously written about proxy love
• Lesbos poet
• Pa hops about Greek poet from Lesbos
• According to Byron, that lady is for burning
• Plato called her 'the tenth Muse'
• Pa hops around the ancient Greek poetess
• Classical lyric poet
• 'The tenth Muse,' per Plato