Roughly holding up end of elephant's trunk (5)
I believe the answer is:
torso
'trunk' is the definition.
(both can mean a person's chest)
'roughly holding up end of elephant's' is the wordplay.
'roughly' becomes 'orso' (synonyms).
'holding up' means one lot of letters go next to another (some letters go underneath or hold up others).
'end of' indicates one should take the final letters.
The last letter of 'elephant' is 't'.
'orso' after 't' is 'TORSO'.
(Other definitions for torso that I've seen before include "Poorly-dressed child" , "Roots out in trunk of the body" , "unfinished work" , "Roost (anag)" , "Roots (anag)" .)