The most common and most likely answer to this crossword clue is the 6 plus 5 letter word OBJETS D’ART
O
B
J
E
T
S
D
â
€
™
A
R
T
Buddy explains!
The straight part
We know that "knick-knacks" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case knick-knacks = objets d’art.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.