Crossword Genius

Sort of system for calculating medical treatment? (7)

Ross

I believe the answer is:

decimal

I'm a little stuck... Click here to teach me more about this clue!

'sort of system for calculating' is the definition.
I can't tell whether this definition defines the answer.

'medical treatment?' is the wordplay.
'treatment?' indicates anagramming the letters (I've seen 'treatment' mean this (letters treated or processed differently)).
'medical' anagrammed gives 'DECIMAL'.

Can you help me to learn more?

(Other definitions for decimal that I've seen before include "Relating to ten" , "A point in maths" , "of Number Ten" , "Using powers of ten" , "Based on the number 10" .)

I've seen this clue in the Evening Standard.
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