What le outré means (6)
I believe the answer is:
wealth
'means' is the definition.
(thesaurus)
'what le outre' is the wordplay.
'outre' indicates an anagram.
'what'+'le'='whatle'
'whatle' anagrammed gives 'WEALTH'.
(Other definitions for wealth that I've seen before include "Riches, worldly goods" , "Material worth" , "An abundance of valuable possessions or money" , "Mammon" , "Possessions and resources" .)