A little shaken at almost touching the buttocks (5)
I believe the answer is:
natal
'touching the buttocks' is the definition.
(relating to the buttocks ie nates)
'a little shaken at almost' is the wordplay.
'a little' indicates the answer is hidden within the clue.
'NATAL' can be found hidden inside 'shaken at almost'.
(Other definitions for natal that I've seen before include "Relating to birth - former South African province" , "Christmas is Jesus's -- day" , "Province of South Africa" , "Of or from one's birth - in S African province" , "Province at one time" .)