"Four Quartets" poet (5)
I believe the answer is:
'four quartets poet' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for eliot that I've seen before include "thin material rejected" , "T.S. or George?" , "T S . . . . . wrote ''The Waste Land''" , "T S . . . . ., great poet of 'The Waste Land'" , "Murder in the Cathedral author" .)