Subject embraced by author Sewell? (5)

I believe the answer is:

horse

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'subject' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe there's a link between them I don't understand?

'embraced by author sewell?' is the wordplay.
'embraced' indicates a hidden word.
'HORSE' is hidden within 'by author sewell'.

Can you help me to learn more?

(Other definitions for horse that I've seen before include "Vaulting block" , "what has croup in the end?" , "Cavalry - gymnastic apparatus" , "drug?" , "Equine quadruped" .)

I've seen this clue in The Telegraph.

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