Patience maybe of one manager overwhelmed by stupor (5,5)
I believe the answer is:
comic opera
'patience maybe' is the definition.
(Patience is an example)
'one manager overwhelmed by stupor' is the wordplay.
'one' becomes 'i' (Roman numeral).
'manager' becomes 'coper' (someone who manages or copes).
'overwhelmed by' means one lot of letters goes inside another (inserted letters get absorbed or overwhelmed).
'stupor' becomes 'coma' (I've seen this in another clue).
'i'+'coper'='icoper'
'icoper' going inside 'coma' is 'COMIC OPERA'.
'of' is the link.
(Other definitions for comic opera that I've seen before include "It has dialogue as well as singing" , "The Marriage of Figaro, for instance" , "Amusing stage work" , "Milton perhaps" , "Amusing stage show" .)