One person exploiting another one taking horse? (4)
I believe the answer is:
user
'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" .)