People shortly to corral horse (7)
I believe the answer is:
inhabit
'people' is the definition.
(people can mean to populate or inhabit)
'shortly to corral horse' is the wordplay.
I cannot really understand how this works, but
'horse' could be 'h' (abbreviation as in horse power) and 'h' is present in the answer.
'shortly' could be 'inabit' (I've seen this in another clue) and 'inabit' is found in the remaining letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for inhabit that I've seen before include "Occupy (dwelling)" , "Live in (a place)" , "Tenant" , "Dwell in" , "people" .)