15 across
Heather
in
Shropshire
borders
close
to
the
heart
of
Percy
Thrower
(7)
Heather in Shropshire borders close to the heart of Percy Thrower (7)
hints
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checks
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hints
The definition is at the end of the clue.
How the clue works
Look at Thrower at the end — that's your definition, a slinger being one who throws. Take the borders of Shropshire (the first and last letters, S and E) and pack LING (a type of heather) inside to get SLINGE, then close to the heart of Percy gives you R, the middle letter of PERCY, tacked on at the end: S+LING+E+R.