Crossword Genius

Nemesis of strangely cheery man (4-5)

Ross

I believe the answer is:

arch-enemy

I'm a little stuck... Click here to teach me more about this clue!

'nemesis' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'strangely cheery man' is the wordplay.
'strangely' indicates anagramming the letters.
'cheery'+'man'='cheeryman'
'cheeryman' anagrammed gives 'ARCH-ENEMY'.

'of' acts as a link.

Can you help me to learn more?

(Another definition for arch-enemy that I've seen is " Principal antagonist".)

I've seen this clue in The Guardian.
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