In brewing, we hear, there's insolvency (4)
I believe the answer is:
ruin
'insolvency' is the definition.
'in brewing we hear' is the wordplay.
I cannot quite see how this works, but
'in' is found in the answer.
This explanation may well be incorrect...
'there's' acts as a link.
Can you help me to learn more?
(Other definitions for ruin that I've seen before include "Destroy completely" , "Dilapidated building" , "Scotch" , "dishonour" , "Destroy; downfall" .)