Without protection, change of emphasis results in accident (6)

I believe the answer is:

mishap

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'accident' is the definition.
(I know that accident can be written as mishap)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for mishap that I've seen before include "An accident or unlucky event" , "Unfortunate minor accident" , "Blow" , "Contretemps" , "An accident, piece of bad luck" .)

I've seen this clue in The Telegraph.

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