Some town errands for proprietor (5)
I believe the answer is:
owner
'proprietor' is the definition.
(I know that proprietor can be written as owner)
'some town errands for' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'OWNER' is hidden in the letters of 'town errands for'.
(Other definitions for owner that I've seen before include "Legal possessor" , "Holder, possessor" , "Title holder?" , "The person in legal possession" , "landlord" .)