Cat taking advantage of medic? (6)
I believe the answer is:
mouser
'cat' is the definition.
(cat that kills mice)
'taking advantage of medic?' is the wordplay.
'taking' is an insertion indicator.
'advantage' becomes 'use' (I've seen this in another clue).
'of medic?' becomes 'mor' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'use' placed into 'mor' is 'MOUSER'.
Can you help me to learn more?
(Other definitions for mouser that I've seen before include "Rodent-catching cat" , "One getting rid of vermin" , "Cat that's good at catching small rodents" , "pest controller" , "Useful mog" .)