Irish poet who wrote The Lake Isle of Innisfree, d. 1939 (5)
I believe the answer is:
yeats
(Other definitions for yeats that I've seen before include "Irish poet and dramatist, d. 1939" , "Irish poet, 1923 Nobel Prize winner" , "W.B. - (Irish poet)" , "Irish poet (The Winding Stair)" , "W B . . . . ., great Irish poet" .)