A magpie caws over gutted nemesis (9)
I believe the answer is:
scavenger
'a magpie' is the definition.
(I know that magpie can be written as scavenger)
'caws over gutted nemesis' is the wordplay.
'caws' becomes 'scar' (I can't explain this - if you can you should give a lot more credence to this answer).
'over' is an insertion indicator.
'gutted' means to look at the middle letters (I've seen 'guts' mean this (the insides of the word)).
'nemesis' becomes 'avenger' (I've seen this in another clue).
The central letters of 'avenger' are 'venge'.
'scar' enclosing 'venge' is 'SCAVENGER'.
Can you help me to learn more?
(Other definitions for scavenger that I've seen before include "Animal which feeds on refuse" , "eg Vulture" , "Person collecting discarded material" , "Carrion-feeder" , "Collector of useful waste" .)