The most common and most likely answer to this crossword clue is the 11 letter word ALL-WEATHER
I've seen this crossword clue in Financial Times
A
L
L
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W
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More clues leading to the result ALL-WEATHER
Buddy explains!

The straight part
We know that "Type of running track" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case type of running track = all-weather.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.
Crossword Answer definitions
ALL-WEATHER adjective- Not affected by climatic conditions; capable of normal operation regardless of precipitation, wind, sun, etc.