The most common and most likely answer to this crossword clue is the 6 letter word CREASE
I've seen this crossword clue in The Guardian
C
R
E
A
S
E
More clues leading to the result CREASE
- Fold your attire finally into case
- Line of troops in action
- Finish getting runs in place for batsman
- American Indian conceals a singular wrinkle
- Legal action about soldiers in line
- Fold on suit pockets
- Tuck sides of robe into luggage
- Tuck, the musical, gets a new lead
- Fold note in suit
- Tuck remarkable skirts into bag
Buddy explains!

The straight part
We know that "Wrinkle" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case wrinkle = crease.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 CREASE mean?
CREASE noun- A line or mark made by folding or doubling any pliable substance; hence, a similar mark, however produced.
- One of the white lines drawn on the pitch to show different areas of play; especially the popping crease, but also the bowling crease and the return crease.
- The circle around the goal, where no offensive players can go.
- The goal crease; an area in front of each goal.
- A crack.
- To make a crease in; to wrinkle.
- To undergo creasing; to form wrinkles.
- To lightly bloody; to graze.
- An Indonesian or Malay dagger with a wavy, or rigid serpentine blade.
- A Moro sword with an asymmetrical blade.
- To stab with a kris.