Son always getting cut off (5)
I believe the answer is:
sever
'cut off' is the definition.
(thesaurus)
'son always getting' is the wordplay.
'son' becomes 's'.
'always' becomes 'ever' ('ever' can be a synonym of 'always').
'getting' says to put letters next to each other.
's'+'ever'='SEVER'
(Other definitions for sever that I've seen before include "Verse (anag)" , "split" , "Divide, cut" , "Divorce" , "Cleave" .)