Crumpled (7)
'crumpled' is the definition.
(synonyms)
This is all the clue.
(Other definitions for creased that I've seen before include "Wrinkled, rumpled" , "Needing ironing" , "Needing to be ironed?" , "Folded" , "Groovy" .)
(Other definitions for buckled that I've seen before include "folded under pressure" , "Fastened up - gave way" , "Bent" , "Securely fastened" , "collapsed" .)