Cryptic crossword clue
Methane gas leak, leak avoiding a running system

The most common and most likely answer to this crossword clue is the 7 letter word FARTLEK

I've seen this crossword clue in Independent
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K

Buddy explains!

The straight part
We know that "running system" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case running system = fartlek.
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 FARTLEK mean?

FARTLEK noun
  1. An athletic training technique, used especially in running, in which periods of intense effort alternate with periods of less strenuous effort in a continuous workout.

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