Cleaned out, son displayed sorrow (5)
I believe the answer is:
swept
'cleaned out' is the definition.
'son displayed sorrow' is the wordplay.
'son' becomes 's'.
'displayed sorrow' becomes 'wept'.
's'+'wept'='SWEPT'
(Other definitions for swept that I've seen before include "what daily did" , "Quickly passed" , "Brushed up (dust)" , "Cleaned by brushing" , "Removed by brushing" .)