English leader’s memory given weight in political group (8)
I believe the answer is:
Here is my best explanation:
'english leader's' is the definition.
I don't understand the rest of the clue.
(Other definitions for cromwell that I've seen before include "Lord Protector (sixteen fifty three to sixteen fifty eight)", "dictator", "Leader of the Roundheads, d.1658", "Thomas or Oliver?", "His forces massacred Irish people in the 17th century", "Roundhead leader", "He gave the Irish the choice of going ''to hell or to Connacht''", "Oliver, Puritan leader during 17th century English Civil War", "Old English statesman" and "Oliver --, Lord Protector".)