The general who wreaked havoc here had a peculiar worm cell (8)

I believe the answer is:

cromwell

(Other definitions for cromwell that I've seen before include "His forces massacred Irish people in the 17th century" , "Old English statesman" , "Thomas or Oliver?" , "Roundhead leader" , "Oliver --, Lord Protector" .)

I've seen this clue in The Irish Times.

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