Entertained by situation, you reportedly saw compilers in stadium (6,7)
I believe the answer is:
circus maximus
'stadium' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see a link between them that I don't see?
'entertained by situation you reportedly saw compilers' is the wordplay.
'entertained by' is an insertion indicator.
'situation' becomes 'circs' (I can't explain this - if you can you should give a lot more credence to this answer).
'you reportedly' becomes 'U' (homophone of 'you').
'saw' becomes 'maxim' (a saw can mean a proverb or maxim).
'compilers' becomes 'us' (the compiler and their colleagues).
'circs' placed around 'u' is 'circus'.
'circus'+'maxim'+'us'='CIRCUS MAXIMUS'
'in' is the link.
Can you help me to learn more?
(Another definition for circus maximus that I've seen is " Largest Roman hippodrome".)