Examination of the decimal system (7)

I believe the answer is:

medical

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'examination' is the definition.
(I know that medical is a type of examination)

'the decimal system' is the wordplay.
'decimal' anagrams to 'MEDICAL'.
But, I'm unsure how the anagram is indicated.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for medical that I've seen before include "Relating to doctoring" , "Relating to doctors" , "Fitness examination" , "Relating to treatment rather than surgery" , "Check-up - declaim (anag)" .)

I've seen this clue in the Evening Standard.

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