Thrive in spring after initial adversity (6)
I believe the answer is:
abound
'thrive' is the definition.
(thesaurus)
'spring after initial adversity' is the wordplay.
'spring' becomes 'bound' (synonyms).
'after' is a charade indicator (letters next to each other).
'initial' says to take the initial letters.
The first letter of 'adversity' is 'a'.
'bound' after 'a' is 'ABOUND'.
'in' is the link.
(Other definitions for abound that I've seen before include "rich" , "Be plentiful - take a jump" , "Be prolific" , "Be plentiful, be present on great quantities" , "Be plentiful, proliferate" .)