Stay worried about English poet (5)
I believe the answer is:
yeats
'poet' is the definition.
(I know that Yeats is a poet)
'stay worried about english' is the wordplay.
'worried' indicates anagramming the letters (worry can mean to interfere with or disturb).
'about' indicates putting letters inside.
'english' becomes 'E' (abbreviation).
'stay' with letters rearranged gives 'yats'.
'yats' placed around 'e' is 'YEATS'.
(Other definitions for yeats that I've seen before include "Irish poet, 1923 Nobel Prize winner" , "William Butler ....., poet and dramatist" , "he wrote" , "Irish poet (The Winding Stair)" , "W. B. -- , Irish poet/dramatist" .)