The most common and most likely answer to this crossword clue is the 3 plus 6 plus 4 letter word OLD WIVES’ TALE
O
L
D
W
I
V
E
S
â
€
™
T
A
L
E
Buddy explains!
The straight part
We know that "A superstition" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a superstition = old wives’ tale.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.