React violently after some people initially spend a lot of money (6,3)
I believe the answer is:
splash out
'spend a lot of money' is the definition.
(I've seen this before)
'react violently after some people initially' is the wordplay.
'react violently' becomes 'lashout' (I've seen this before).
'after' is a charade indicator (letters next to each other).
'initially' says to take the initial letters.
The first letters of 'some people' is 'sp'.
'lashout' after 'sp' is 'SPLASH OUT'.
(Other definitions for splash out that I've seen before include "Spend money freely" , "extravagant" , "Spend a lot of money" , "Blow brass" .)