21 across
Rock
maybe
cut
mountain
climber
(5,3)
Rock maybe cut mountain climber (5,3)
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The definition is at the end of the clue.
How the clue works
The definition is climber — a sweet pea being a climbing plant. Rock maybe gives you SWEET, since rock is one example of a sweet, and cut mountain gives you PEA — take PEAK (a mountain) and cut its last letter off.