3 down
Hard
rock
capturing
the
heart
of
Mason
Mount
(5)
Hard rock capturing the heart of Mason Mount (5)
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The definition is at the end of the clue.
How the clue works
Right, so Mount at the end is the definition — a horse you'd ride. For the wordplay, "Hard" gives you H, and "rock" gives ORE. Then you need the heart (middle letter) of "Mason", which is S, tucked inside ORE to make ORSE — stick the H on the front and you're there.