9 across
Sprinter
in
bar
bent
back
to
grasp
nuts
(1,4)
Sprinter in bar bent back to grasp nuts (1,4)
hints
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checks
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hints
The definition is at the beginning of the clue.
How the clue works
The Sprinter is Usain Bolt, written as U BOLT. A bar bent back forms the shape of a U, and BOLT is what grasps nuts (as in nuts and bolts), giving the two parts of the charade.