The most common and most likely answer to this crossword clue is the 11 letter word OFF-PUTTING
I've seen this crossword clue in The Guardian
O
F
F
-
P
U
T
T
I
N
G
Buddy explains!

The straight part
We know that "discouraging" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case discouraging = off-putting.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.
What does OFF-PUTTING mean?
OFF-PUTTING adjective- Disconcerting, annoying or repulsive; tending to put off.