One who held up Heaven gets time in the end (2,4)
I believe the answer is:
at last
'in the end' is the definition.
(synonyms)
'one who held up heaven gets time' is the wordplay.
I cannot quite understand how this works, but
'one' could be 'a' (a thing is one thing) and 'a' is present in the answer.
'time' could be 't' (abbreviation) and 't' is found in the answer.
The remaining letters 'last' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for at last that I've seen before include "None too soon" , "Finally, after a long wait" , "Finally, having waited a long time" , "Finally, after much delay" , "working as a cobbler?" .)