Present behind wrapping paper ultimately for Charlie (5)
I believe the answer is:
moron
'charlie' is the definition.
(Charlie can informally mean a fool)
'present behind wrapping paper ultimately' is the wordplay.
'present behind' becomes 'moon' (to moon is to show one's bottom).
'wrapping' is an insertion indicator.
'ultimately' says to take the final letters.
The last letter of 'paper' is 'r'.
'moon' enclosing 'r' is 'MORON'.
'for' is the link.
(Other definitions for moron that I've seen before include "Somewhat feeble-minded person" , "Foolish or stupid person" , "Blockhead" , "Fool" , "Idiot" .)