The most common and most likely answer to this crossword clue is the 7 letter word POM-POM
I've seen this crossword clue in The Times
P
O
M
-
P
O
M
More clues leading to the result POM-POM
- Washers the wrong way round in gun
- Weapon made by two Englishmen down under
- With grand ceremony, order anti- aircraft gun
- Englishmen abroad getting decoration
- Cannon ball found on a cap?
- Twice take care of the final details of cheerleader's prop
- Decorative ball made by two Englishmen in Australia
- British artillery gun’s part of the cheerleader’s accessories
- Woolen ball to two little dogs
- Repeating Brit ack-ack gun
Buddy explains!

The straight part
We know that "gun" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case gun = pom-pom.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 POM-POM mean?
POM-POM noun- A rapid-firing small-calibre cannon used especially as an anti-aircraft gun.
- A decorative ball made of pieces of soft fabric bound at the centre, most notably used in cheerleading.