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Carefree Berliner is mistakenly keeping performance short (13)

Ross

I believe the answer is:

irresponsible

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'carefree' is the definition.
(similar in meaning)

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(Other definitions for irresponsible that I've seen before include "Unreliable" , "Negligent" , "Wantonly careless" , "Showing a lack of care for consequences" , "Reprehensibly careless" .)

I've seen this clue in The Telegraph.
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