People fixing equipment on back parts where horses are kept (10)
I believe the answer is:
installers
'people fixing equipment' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.
'on back parts where horses are kept' is the wordplay.
'on' becomes 're' ('on' can be mean 'with reference to').
'back' shows that the letters should be reversed in order.
'parts' indicates putting letters inside (inserted letters separate or part others).
'where horses are kept' becomes 'installs' (I can't justify this - if you can you should give a lot more credence to this answer).
're' reversed gives 'er'.
'er' inserted within 'installs' is 'INSTALLERS'.
Can you help me to learn more?