Spoils isle with dung stacks (8)
I believe the answer is:
indulges
'stacks' is the definition.
Although both the answer and definition are verbs in their -s form, I can't understand how one could define the other.
'spoils isle with dung' is the wordplay.
'spoils' indicates an anagram.
'with' means one lot of letters go next to another.
'isle' put after 'dung' is 'dungisle'.
'dungisle' with letters rearranged gives 'INDULGES'.
Can you help me to learn more?
(Other definitions for indulges that I've seen before include "Allows person to have what he wants, gratifies wish" , "Allows (someone) their desire" .)