23 across
Runner
should
keep
improving
from
the
start
(3)
Runner should keep improving from the start (3)
hints
0
checks
0
hints
The definition is at the beginning of the clue.
How the clue works
The definition is Runner — a ski is a runner in the sense of a blade that slides along a surface. For the wordplay, "from the start" tells you to grab the initial letters: Should Keep gives you SK, then Improving gives you the I.