He upsets both Ronald and Roland (6)

I believe the answer is:

arnold

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'he' is the definition.

'upsets both ronald and roland' is the wordplay.
'ronald' can be anagrammed to 'ARNOLD'.
Though, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for arnold that I've seen before include "Headmaster, poet or composer" , "Another poet" , "Essayist" , "Sir Malcolm -, English composer" , "Sir Malcolm -, composer (Bridge over the River Kwai)" .)

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

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