Battles over medicine (7)
I believe the answer is:
tablets
'medicine' is the definition.
Although both the answer and definition are nouns, they are not in the same form of the noun.
'battles over' is the wordplay.
'over' indicates an anagram.
'battles' is an anagram of 'TABLETS'.
Can you help me to learn more?
(Other definitions for tablets that I've seen before include "Pellets of medicine" , "Battles (anag.)" , "Pills" .)