Welsh poet Thomas (5)
I believe the answer is:
dylan
'welsh poet thomas' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for dylan that I've seen before include "Bob Zimmerman" , "Bob --, Nobel prize winner" , "Bob --, US folk singer" , "Bob (singer) - Thomas (author)" , "Bob (musician) or Thomas (poet)" .)