Unable to move second pleat (5)
I believe the answer is:
stuck
'unable to move' is the definition.
(I've seen this before)
'second pleat' is the wordplay.
'second' becomes 's' (common abbreviation).
'pleat' becomes 'tuck' (tuck is a kind of pleat).
's'+'tuck'='STUCK'
(Other definitions for stuck that I've seen before include "Trapped" , "Will's thrust" , "Baffled" , "Lodged" , "Unable to move" .)