Crossword Genius

What attracts sick hatemongers outside Oxford? (9,6)

Ross

I believe the answer is:

horseshoe magnet

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

'what attracts' is the definition.
I can't judge whether this definition defines the answer.

'sick hatemongers outside oxford?' is the wordplay.
'sick' indicates an anagram.
'outside' indicates putting letters inside (some letters go outside others).
'oxford?' becomes 'shoe' (oxford is a kind of shoe).
'hatemongers' with letters rearranged gives 'horsemagnet'.
'horsemagnet' going around 'shoe' is 'HORSESHOE MAGNET'.

Can you help me to learn more?

(Another definition for horseshoe magnet that I've seen is " what's attractive".)

I've seen this clue in The Guardian.
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