"Old Possum's Book of Practical Cats” writer (5)

I believe the answer is:

eliot

(Other definitions for eliot that I've seen before include "British poet, d. 1965" , "thin material rejected" , "T S . . . . ., great poet of 'The Waste Land'" , "Practical Cats author" , "The Waste Land author" .)

I've seen this clue in The Wall Street Journal.

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