The most common and most likely answer to this crossword clue is the 5 letter word DEBYE
D
E
B
Y
E
Buddy explains!
The straight part
We know that "Some moment" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case some moment = debye.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 DEBYE mean?
DEBYE noun- The CGS unit of electric dipole moment, defined as 1 D = 10-18 statcoulomb-centimetre and computable from the SI unit coulomb-metre by multiplying by the factor 3.33564 × 10-30.