What Michael Faraday had, one imagines (3)

I believe the answer is:

elf

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'what michael faraday had one imagines' is the definition.
I can't judge whether this defines the answer.

'what michael faraday had' is the wordplay.
'had' says the answer is hidden in the clue (I've seen 'have' mean this).
'ELF' is hidden within 'what michael faraday'.

Can you help me to learn more?

(Other definitions for elf that I've seen before include "Imaginary creature" , "A leprechaun" , "Imaginary small being of selfish kind" , "Fairy-like creature" , "Mischievous fairy No.2" .)

I've seen this clue in the Evening Standard.

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