The most common and most likely answer to this crossword clue is the 3 plus 2 plus 4 letter word HIT OR MISS
H
I
T
O
R
M
I
S
S
Buddy explains!
The straight part
We know that "with no guarantee of result" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case with no guarantee of result = hit or miss.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 HIT OR MISS mean?
HIT OR MISS adjective- Inconsistent, unpredictable, erratic; sometimes succeeding and sometimes failing.