It's a put-up job (12)

I believe the answer is:

construction

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'job' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe there's a link between them I don't understand?

I can't explain the rest of the clue.

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(Other definitions for construction that I've seen before include "Act of building" , "Industry of erecting buildings" , "Process of erecting buildings" , "Building; interpretation" .)

I've seen this clue in The Globe and Mail.

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