Plunderer took spoil with a rude abandon (8)
I believe the answer is:
marauder
'plunderer' is the definition.
(thesaurus)
'spoil with a rude abandon' is the wordplay.
'spoil' becomes 'mar' (synonyms).
'with' indicates putting letters inside.
'abandon' indicates an anagram (I've seen 'abandoned' mean this (the original order is abandoned)).
'rude' is an anagram of 'uder'.
'a' inserted inside 'uder' is 'auder'.
'mar'+'auder'='MARAUDER'
'took' acts as a link.
I am not very happy about this link. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for marauder that I've seen before include "Predator" , "Brigand" , "person in search of prey and plunder" , "Roving robber" , "'One runs wild, plundering and pillaging (8)'" .)