Owner’s torpor ripe for change (10)
I believe the answer is:
proprietor
'owner's' is the definition.
(synonyms)
'torpor ripe for change' is the wordplay.
'for change' indicates an anagram (I've seen this in other clues).
'torpor'+'ripe'='torporripe'
'torporripe' is an anagram of 'PROPRIETOR'.
(Other definitions for proprietor that I've seen before include "Landlord" , "Business owner" .)