Wrinkle or crease (up) (4)
I believe the answer is:
ruck
(Other definitions for ruck that I've seen before include "A crease; loose scrum" , "Fight" , "Rugby scrum or crease in dress" , "Cower" , "Tightly packed crowd" .)
I believe the answer is:
ruck
(Other definitions for ruck that I've seen before include "A crease; loose scrum" , "Fight" , "Rugby scrum or crease in dress" , "Cower" , "Tightly packed crowd" .)