Cornered after son gets beaten (8)
I believe the answer is:
strapped
'beaten' is the definition.
(strapping is a kind of beating)
'cornered after son' is the wordplay.
'cornered' becomes 'trapped' ('trapped' can be a synonym of 'cornered').
'after' says to put letters next to each other.
'son' becomes 's'.
'trapped' after 's' is 'STRAPPED'.
'gets' is the link.
(Other definitions for strapped that I've seen before include "whipped" , "not generating enough cash?" , "- - for cash (hard up)" , "Needy - secured" , "affected by shortage" .)