The most common and most likely answer to this crossword clue is the 3 plus 7 letter word NON STARTER
I've seen this crossword clue in The Daily Telegraph
N
O
N
S
T
A
R
T
E
R
More clues leading to the result NON STARTER
Buddy explains!

The straight part
We know that ",/no-hoper" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case ,/no-hoper = non starter.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 NON STARTER mean?
NON STARTER noun- Someone or something who was listed to start in a race, but did not start in the race.
- Something that is destined to fail from the outset; an impractical scheme.
- An idea or argument that cannot be sensibly debated.