Exam claimed to be fiddled (7)

I believe the answer is:

medical

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'exam' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'claimed to be fiddled' is the wordplay.
'to be fiddled' indicates an anagram.
'claimed' anagrammed gives 'MEDICAL'.

Can you help me to learn more?

(Other definitions for medical that I've seen before include "Declaim (anag) -- health check" , "examination carried out by a doctor" , "Relating to doctoring" , "Examination of physical health" , "Thorough health check" .)

I've seen this clue in the Evening Standard.

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