Blunder on stage (5)
I believe the answer is:
fluff
This clue might be a double definition.
'blunder' is the first definition.
(I know that fluff is a type of blunder)
'stage' is the second definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'on' is the link.
Can you help me to learn more?
(Other definitions for fluff that I've seen before include "Mess up" , "The fuzz" , "picked up by vacuum cleaner?" , "blooper" , "Deliver badly" .)