Examination claimed to be in error (7)
I believe the answer is:
medical
'examination' is the definition.
(medical examination is a kind of examination)
'claimed to be in error' is the wordplay.
'to be in error' indicates anagramming the letters.
'claimed' is an anagram of 'MEDICAL'.
(Other definitions for medical that I've seen before include "Of the science dealing with treatment of disease" , "Declaim (anag) -- health check" , "Relating to the art of healing" , "Test for health" , "Thorough health check" .)