Nothing wrong in one piece (3,5)

I believe the answer is:

all right

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'in one piece' is the definition.
(in one piece can mean all right or safe)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for all right that I've seen before include "Fair enough" , "no mistake!" , "Nothing left" , "Very well, whatever you say" , "Acceptable; I concur" .)

I've seen this clue in The Telegraph.

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