He was hated for ill-treatment (5,6)

I believe the answer is:

adolf hitler

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'he' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'hated for ill-treatment' is the wordplay.
'treatment' indicates anagramming the letters.
'hated'+'for'+'ill'='hatedforill'
'hatedforill' is an anagram of 'ADOLF HITLER'.

'was' is the link.

Can you help me to learn more?

(Another definition for adolf hitler that I've seen is " Fascist leader".)

I've seen this clue in The Globe and Mail.

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