Warner Bros' first canoe up the creek (6)
I believe the answer is:
beacon
'warner' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see a link between them that I don't see?
'bros' first canoe up the creek' is the wordplay.
'bros' first' becomes 'b' (1st letter of 'bros').
'up the creek' indicates anagramming the letters.
'canoe' with letters rearranged gives 'eacon'.
'b'+'eacon'='BEACON'
Can you help me to learn more?
(Other definitions for beacon that I've seen before include "Warning light on a high point" , "Warning light on tower or hill" , "Warning or guiding device" , "Raised signal fire or light" , "Watch fire" .)