Proposition those people to accept output of quarry (7)
I believe the answer is:
theorem
'proposition' is the definition.
(theorem is a kind of proposition)
'those people to accept output of quarry' is the wordplay.
'those people' becomes 'them' ('they' refers to a group of people).
'to accept' indicates putting letters inside.
'output of quarry' becomes 'ore' (I can't justify this - if you can you should give a lot more credence to this answer).
'them' placed around 'ore' is 'THEOREM'.
Can you help me to learn more?
(Other definitions for theorem that I've seen before include "Mathematical statement to be proved" , "this has been established" , "Proof" , "Logical proposition" , "Proven hypothesis" .)
