Gemma isn't bewitched by powerful attraction (9)

I believe the answer is:

magnetism

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'powerful attraction' is the definition.
'magnetism' can be an answer for 'attraction' (magnetism is a kind of attraction). I am not sure about the 'powerful' bit.

'gemma isn't bewitched' is the wordplay.
'bewitched' indicates anagramming the letters.
'gemma'+'isnt'='gemmaisnt'
'gemmaisnt' is an anagram of 'MAGNETISM'.

'by' is the link.

Can you help me to learn more?

(Other definitions for magnetism that I've seen before include "Attractive force" , "Attraction" , "Drawing power" , "Charisma" .)

I've seen this clue in The Irish Times.

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