Crossword Genius

One person exploiting another one taking horse? (4)

Ross

I believe the answer is:

user

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

'one person' is the definition.
(I know that user is a type of human)

'exploiting another one taking horse?' is the wordplay.
I cannot quite see how this works, but
'another' could be 'r' (I've seen this in other clues) and 'r' is found in the answer.
The remaining letters 'use' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for user that I've seen before include "Person who takes drugs" , "Ruse for employer" , "Maybe one needing pot" , "Substance taker" , "junkie" .)

I've seen this clue in The Independent.
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