The most common and most likely answer to this crossword clue is the 9 plus 3 letter word BUTTERFLY NET
I've seen this crossword clue in The Sunday Telegraph
B
U
T
T
E
R
F
L
Y
N
E
T
More clues leading to the result BUTTERFLY NET
Buddy explains!
The straight part
We know that "might there be a comma in there" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case might there be a comma in there = butterfly net.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.