Rose sounded triumphant, making a hundred grand (4)
I believe the answer is:
grew
'rose' is the definition.
(I've seen this before)
'sounded triumphant making a hundred grand' is the wordplay.
I cannot really understand how this works, but
'grand' could be 'g' (G is short for grand as in a thousand) and 'g' is located in the answer.
The remaining letters 'rew' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for grew that I've seen before include "Sprouted" , "Got bigger" , "Increased in size" , "Rose" , "Developed, matured" .)