Erato and her sisters
I believe the answer is:
muses
'erato and her sisters' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for muses that I've seen before include "Inspirational female group" , "In Greek and Roman myth, nine goddesses of the arts" , "Nine goddesses, inspirations for artists" , "Meditates on the nine goddesses" , "'Nine daughters of Zeus, inspirations for artists (5)'" .)