6 down
Peninsula
of
Palermo
–
if
rock
climbing
regularly
(6)
Peninsula of Palermo – if rock climbing regularly (6)
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The definition is at the beginning of the clue.
How the clue works
The definition is Peninsula — the Crimea being the obvious one. For the wordplay, take the alternate letters ("regularly") from Palermo if rock, which pulls out A, E, M, I, R, C, and then climbing tells you to reverse that selection, giving you CRIMEA.