Song that once charmed Ulysses (7)
I believe the answer is:
calypso
'song' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for calypso that I've seen before include "Keeper of the Ithacan king" , "Satirical West Indian song and dance" , "Topical West Indian song - orchid - sea nymph" , "West Indian ballad rhythm" , "island song" .)