Father and son rage (4)
I believe the answer is:
sire
'father' is the definition.
(I know that father can be written as sire)
'son rage' is the wordplay.
'son' becomes 's' (genealogical abbreviation for son).
'rage' becomes 'ire' (I've seen this in another clue).
's'+'ire'='SIRE'
'and' acts as a link.
(Other definitions for sire that I've seen before include "Male parent of an animal" , "Rise for male parent (4)." , "Make children" , "Generator" , "Foal's father" .)