Catch son and keep scolding (4)
I believe the answer is:
snag
'catch' is the definition.
(snagging is a kind of catching)
'son and keep scolding' is the wordplay.
'son' becomes 's' (genealogical abbreviation for son).
'and' says to put letters next to each other.
'keep scolding' becomes 'nag' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
's'+'nag'='SNAG'
Can you help me to learn more?
(Other definitions for snag that I've seen before include "Stumbling block" , "Problem or drawback" , "Hidden obstacle or drawback" , "hurdle?" , "Complication, drawback" .)