The most common and most likely answer to this crossword clue is the 7 letter word MONOSKI
I've seen this crossword clue in The Times
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More clues leading to the result MONOSKI
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The straight part
We know that "broad runner" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case broad runner = monoski.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does MONOSKI mean?
MONOSKI noun- A variant of a downhill skiing/alpine skiing ski, that is very wide, allowing for both right and left ski boots to the attached to the same ski, with a doubled-up set of bindings, placed side-by-side. It has the appearance of an extremely wide ski or narrow alpine snowboard, though with binding mounting locations similar to that of a regular ski.
- A type of sitski with a single ski, used by wheelchair-bound skiers in downhill skiing and para-alpine. It is paired with outriggers, ski poles that have skis attached to the bottom, instead of the pick/spike, to function as outrigger runners for the skier sitting in the monoski.
- To use a monoski; to participate in monoskiing.