10 across
Sporty
type
beneath
the
surface,
but
one
who’ll
give
in?
(5)
Sporty type beneath the surface, but one who’ll give in? (5)
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The whole clue is the definition (& lit or double definition).
How the clue works
Two definitions doing the work here, both pointing the same way. First up, Sporty type beneath the surface — that's just your everyday underground adventurer, someone who goes potholing. Then there's the cheeky bit, one who'll give in? — think "cave in", meaning to yield, so a CAVER is literally "one who'll give in", if you squint at it that way.