W H —, author of poetry collections Homage to Clio and The Shield of Achilles (5)
I believe the answer is:
auden
(Other definitions for auden that I've seen before include "W. H. ... (British poet)" , "British-born American poet" , "US poet born in Britain" , "W. H. -, English-born poet" , "Wystan Hugh -, poet" .)