Della's boss (5)
I believe the answer is:
perry
'della's boss' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for perry that I've seen before include "Fred -, British Wimbledon winner nineteen thirty four to nineteen thirty six" , "Alcoholic fruit drink" , "Alcoholic pear drink" , "-- Como, singer" , "Pear wine" .)