Great man rejected — Biden finally getting busy (5)
I believe the answer is:
titan
'great man' is the definition.
(I've seen this before)
'rejected biden finally getting busy' is the wordplay.
'rejected' shows that the letters should be reversed in order.
'finally' suggests the final letters.
'getting' means one lot of letters go next to another.
'busy' becomes 'atit' (I've seen this before).
The final letter of 'biden' is 'n'.
'n'+'atit'='natit'
'natit' in reverse letter order is 'TITAN'.
(Other definitions for titan that I've seen before include "very big" , "Saturn's largest satellite" , "Saturn's moon" , "Goddess" , "A son of Uranus and Gaea" .)