Landslide victory gained by one in a Chanel ensemble (9)
I believe the answer is:
avalanche
'landslide' is the definition.
(I've seen this before)
'victory gained by one in a chanel ensemble' is the wordplay.
'victory' becomes 'v'.
'gained by' becomes 'aa' (I can't justify this - if you can you should believe this answer much more).
'one in' is an insertion indicator.
'ensemble' indicates an anagram.
'v' placed into 'aa' is 'ava'.
'chanel' is an anagram of 'lanche'.
'ava'+'lanche'='AVALANCHE'
Can you help me to learn more?
(Other definitions for avalanche that I've seen before include "Great snowfall" , "falling-out in the Highlands?" , "Rapid movement of a large mass of snow or ice" , "Slide of large amounts of snow or stone" , "Mass of snow falling down a mountain" .)