The most common and most likely answer to this crossword clue is the 4 letter word MAXI
I've seen this crossword clue in The Guardian
M
A
X
I
More clues leading to the result MAXI
- Gnome’s short skirt
- Saw second maiden cast off long dress
- 9am to rise and dress
- Very large film format, top to bottom
- Team attached to mother’s skirt
- The most mum’s chucked out is a skirt
- Saw shortened dress
- Team hiding under mother’s skirt
- Endless sea with crossing in large yacht
- Old woman gets by with single skirt
Buddy explains!

The straight part
We know that "a skirt" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a skirt = maxi.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 MAXI mean?
MAXI noun- A coat or skirt having such a hemline
- Having a hemline at ankle length
- A class of racing sailing yacht that pushes at the upper limits of the International Offshore Rule of regulated sail yacht racing, having a waterline length in excess of 70-feet.
- A music single with more than two tracks, i.e. not just an A-side and a B-side.
- A maxi boat
- The highest limit
- The greatest value of a set or other mathematical structure, especially the global maximum or a local maximum of a function
- An upper bound of a set which is also an element of that set
- The largest value of a batch or sample or the upper bound of a probability distribution
- A 147 break; the highest possible break
- A score of 180 with three darts
- A scoring shot for 6 runs