Detail fault in copiers (9)
I believe the answer is:
precision
'detail' is the definition.
(thesaurus)
'fault in copiers' is the wordplay.
'fault' indicates an anagram (a faulty spelling).
'in'+'copiers'='incopiers'
'incopiers' with letters rearranged gives 'PRECISION'.
(Other definitions for precision that I've seen before include "Exactness, sharpness" , "Exactitude" , "Accuracy, exactness" , "Care" , "Meticulousness" .)