Titan condemned to hold up the heavens (5)
I believe the answer is:
atlas
'titan condemned to hold up the heavens' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for atlas that I've seen before include "He had the world on his shoulders" , "Size of paper once" , "In Greek myth, a Titan made to support the heavens" , "Album of maps" , "Sky carrier - map book" .)