The most common and most likely answer to this crossword clue is the 9 letter word BESPANGLE
B
E
S
P
A
N
G
L
E
Buddy explains!
The straight part
We know that "that should make things sparkle" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case that should make things sparkle = bespangle.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 BESPANGLE mean?
BESPANGLE verb- To cover something with spangles.