The most common and most likely answer to this crossword clue is the 8 plus 2 plus 5 letter word CHERCHEZ LA FEMME
I've seen this crossword clue in Independent
C
H
E
R
C
H
E
Z
L
A
F
E
M
M
E
More clues leading to the result CHERCHEZ LA FEMME
Buddy explains!
The straight part
We know that "hint about motivation" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case hint about motivation = cherchez la femme.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.