Viewers left entertainment (9,5)
I believe the answer is:
spectator sport
'entertainment' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see a link between them that I don't see?
'viewers left' is the wordplay.
'viewers' becomes 'spectators' ('spectator' can be a synonym of 'viewer').
'left' becomes 'port' (left side of a ship - opposite of starboard).
'spectators'+'port'='SPECTATOR SPORT'
Can you help me to learn more?
(Other definitions for spectator sport that I've seen before include "For example, cricket" , "Eg, football" , "something to watch" , "one to watch" , "You're not invited to join in this" .)