Crossword Genius

Severe piles? Sit differently! (8)

Ross

I believe the answer is:

pitiless

'severe' is the definition.
(thesaurus)

'piles? sit differently' is the wordplay.
'differently' indicates an anagram.
'piles'+'sit'='pilessit'
'pilessit' anagrammed gives 'PITILESS'.

(Other definitions for pitiless that I've seen before include "feeling nothing" , "Cold-hearted" , "Unfeeling" , "Harsh, cruel" , "Callous" .)

I've seen this clue in The Telegraph.
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