Sort of horse one maybe hires? (5)
I believe the answer is:
shire
'sort of horse' is the definition.
'one maybe hires?' is the wordplay.
'one maybe' indicates anagramming the letters.
'hires' anagrammed gives 'SHIRE'.
(Other definitions for shire that I've seen before include "Powerful draught horse" , "Devon maybe" , "Rural county" , "English county" , "Berks" .)