Bountiful dynasty needing initial support, of course (7)
I believe the answer is:
teeming
'bountiful' is the definition.
(thesaurus)
'dynasty needing initial support of course' is the wordplay.
'dynasty' becomes 'ming' (Ming dynasty of China).
'needing initial' is a charade indicator (letters next to each other) (some letters go before others).
'support of course' becomes 'tee' (support for ball on golf course).
'ming' after 'tee' is 'TEEMING'.
(Other definitions for teeming that I've seen before include "Full of people" , "Chock-a-block" , "Swarming in to meeting" , "Alive" , "Pouring - abounding" .)