Annoyed when halves are switched in this production (6)

I believe the answer is:

output

'production' is the definition.
(output is a kind of production)

I can't explain the rest of the clue.

(Other definitions for output that I've seen before include "Amount of work done in given period" , "Amount produced by a worker or machine" , "Quantity or amount of something produced" , "fruit" , "Production, yield" .)

I've seen this clue in The Times.

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