Proprietor getting some children worked up (5)
I believe the answer is:
owner
'proprietor' is the definition.
(I know that proprietor can be written as owner)
'some children worked up' is the wordplay.
'some' indicates a hidden word (some parts of the word are used).
'up' says the letters should be written backwards (in down clue: letters go upwards).
'renwo' is hidden within 'children worked'.
'renwo' in reverse letter order is 'OWNER'.
'getting' acts as a link.
(Other definitions for owner that I've seen before include "One who possesses" , "possessive type" , "The person in lawful possession" , "Holder, possessor" , "Possessor, proprietor" .)