People dressed for riding? (7)
I believe the answer is:
inhabit
'people dressed for riding?' is the definition.
'inhabit' can be an answer for 'people' (people can mean to populate or inhabit). I am not certain of the 'dressed for riding?' bit.
This is all the clue.
Can you help me to learn more?
(Other definitions for inhabit that I've seen before include "Tenant" , "Occupy - settle" , "Dwell in" , "Live in, occupy" , "Occupy (dwelling)" .)