The most common and most likely answer to this crossword clue is the 9 letter word NON-SKIER
I've seen this crossword clue in Financial Times
N
O
N
-
S
K
I
E
R
Buddy explains!
The straight part
We know that "Perhaps Isère and Louron ultimately no risk for him" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case perhaps isère and louron ultimately no risk for him = non-skier.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.