New medical system? (7)
I believe the answer is:
decimal
'system?' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'new medical' is the wordplay.
'new' is an anagram indicator.
'medical' with letters rearranged gives 'DECIMAL'.
Can you help me to learn more?
(Other definitions for decimal that I've seen before include "of Number Ten" , "In base ten" , "Based on the number 10" , "(System) based on tens" , "Claimed, wrongly, to have this currency" .)