Angrily rebuke son lacking warmth (5)
I believe the answer is:
scold
'angrily rebuke' is the definition.
(I've seen this before)
'son lacking warmth' is the wordplay.
'son' becomes 's' (genealogical abbreviation for son).
'lacking warmth' becomes 'cold' (I've seen this before).
's'+'cold'='SCOLD'
(Other definitions for scold that I've seen before include "Chide - nag" , "Chide or reprimand" , "Complaining woman" , "Angrily rebuke" , "quarrelsome woman of old?" .)