17/19 across
Cannon
and
Ball
(3-3)
Cannon and Ball (3-3)
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The whole clue is the definition (& lit or double definition).
How the clue works
This is a neat double definition: Cannon gives you the answer because a pom-pom is a rapid-fire gun, and Ball also works because a pom-pom is one of those fluffy decorative balls you'd see on a woolly hat or waved by cheerleaders.