Amount produced revealed change (7)

I believe the answer is:

outturn

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'amount' is the definition.
Both the answer and definition are singular nouns.
Maybe there's an association between them I don't understand?

'revealed change' is the wordplay.
'revealed' becomes 'out' (I've seen this before).
'change' becomes 'turn' (turn is a kind of change).
'out'+'turn'='OUTTURN'

'produced' is the link.

Can you help me to learn more?

(Other definitions for outturn that I've seen before include "Result of work or activity - turn out for it" , "Result, consequence" , "Quantity produced; result of events" .)

I've seen this clue in The Guardian.

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