Crossword Genius

One prepared to work like a horse? (6)

Ross

I believe the answer is:

trojan

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

'a horse?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'one prepared to work' is the wordplay.
I cannot really see how this works, but
'one' could be 'an' (an apple is one apple) and 'an' is found in the answer.
This explanation may well be incorrect...

'like' acts as a link.

Can you help me to learn more?

(Other definitions for trojan that I've seen before include "Paris, for example - harmful computer program" , "Of Troy or its people" , "Dedicated worker" , "Sort of horse" , "Native of Troy" .)

I've seen this clue in the Evening Standard.
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