Irish poet (1865-1939) (5)
I believe the answer is:
yeats
'irish poet' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for yeats that I've seen before include "Poet William Butler or painter Jack B" , "Irish poet, 1923 Nobel Prize winner" , "W.B. - (Irish poet)" , "William Butler .. . . ., Nobel-winning poet" , "he wrote" .)