Totally defeat Ian in the LA games (10)
I believe the answer is:
annihilate
'totally defeat ian in the la games' is the definition.
I can't judge whether this definition defines the answer.
'ian in the la games' is the wordplay.
'games' indicates an anagram (I've seen 'game' mean this (solving anagrams is a game)).
'ian'+'in'+'the'+'la'='ianinthela'
'ianinthela' is an anagram of 'ANNIHILATE'.
Can you help me to learn more?
(Other definitions for annihilate that I've seen before include "Utterly destroy" , "Completely defeat" , "Wipe out" .)