Poet who provided the mare with some hay? (7)
I believe the answer is:
herrick
'poet' is the definition.
(I know that Herrick is a poet)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for herrick that I've seen before include "Gather ye rosebuds poet" , "Lyric poet" , "Robert --, English poet" .)