"The Second Coming" poet (5)
I believe the answer is:
yeats
'the second coming poet' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for yeats that I've seen before include "Irish poet, 1923 Nobel Prize winner" , "W B . . . . ., great Irish poet" , "William Butler .. . . ., Nobel-winning poet" , "William Butler ..., great Irish poet" , "Irish poet (The Winding Stair)" .)