The most common and most likely answer to this crossword clue is the 3 plus 2 plus 3 plus 5 letter word NOT IN THE LEAST
N
O
T
I
N
T
H
E
L
E
A
S
T
Buddy explains!
The straight part
We know that "Never" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case never = not in the least.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.