The most common and most likely answer to this crossword clue is the 8 letter word BYPASSES
I've seen this crossword clue in Independent
B
Y
P
A
S
S
E
S
Buddy explains!

The straight part
We know that "skirts" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case skirts = bypasses.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 BYPASSES mean?
BYPASSES noun- A road that passes around something, such as a residential area
- A circumvention
- A section of pipe that conducts a fluid around some other fixture
- An electrical shunt
- An alternative passage created to divert a bodily fluid around a damaged organ; the surgical procedure to construct such a bypass
- To avoid an obstacle etc, by constructing or using a bypass
- To ignore the usual channels or procedures