Cinema put out exercise, useful when breaking up (9,5)

I believe the answer is:

pneumatic drill

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'useful when breaking up' is the definition.
I can't judge whether this definition defines the answer.

'cinema put out exercise' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'exercise' becomes 'drill' (synonyms).
'cinema'+'put'='cinemaput'
'cinemaput' with letters rearranged gives 'pneumatic'.
'pneumatic'+'drill'='PNEUMATIC DRILL'

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I've seen this clue in The Daily Express.

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