The earth? Throw into empty grave (5)
I believe the answer is:
globe
'the earth?' is the definition.
('globe' can be a synonym of 'earth')
'throw into empty grave' is the wordplay.
'throw' becomes 'lob' (to lob something is to chuck or throw it).
'into' indicates putting letters inside.
'empty' says to hollow out the word (remove centre letters).
'grave' with its centre removed is 'ge'.
'lob' placed within 'ge' is 'GLOBE'.
(Other definitions for globe that I've seen before include "Boston, MA's newspaper" , "House 8 [OF SHAKESPEARE]" , "Spherical shape" , "The round world" , "Earth - sphere" .)