T S Eliot's quirky figure of speech (7)
I believe the answer is:
litotes
'figure of speech' is the definition.
(thesaurus)
't s eliot's quirky' is the wordplay.
'quirky' indicates an anagram.
't'+'s'+'eliot'='tseliot'
'tseliot' with letters rearranged gives 'LITOTES'.
(Other definitions for litotes that I've seen before include "Figure of speech about toilets" , "An ironic understatement about toilets" , "Ironic figure of speech" , "Town of N. Norway" , "No little pain, say" .)