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Pair
of
wrestlers
spray
graffiti
on
several
mules
(3,4)
Pair of wrestlers spray graffiti on several mules (3,4)
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The definition is at the beginning of the clue.
How the clue works
The definition is Pair of wrestlers, which is exactly what a tag team is. For the wordplay, TAG is what you do when you spray graffiti, and "on" simply sits between the parts, leading to TEAM, which is the word for several mules harnessed together.