Nuts to take out credit for son's million pounds (8)
I believe the answer is:
smackers
'nuts to take out credit' is the definition.
I can't tell whether this defines the answer.
'son's million pounds' is the wordplay.
'million' becomes 'm' (abbreviation).
'pounds' becomes 'ackers' (I can't justify this - if you can you should give a lot more credence to this answer).
's'+'m'+'ackers'='SMACKERS'
'for' is the link.
Can you help me to learn more?
(Other definitions for smackers that I've seen before include "worth more than one pound" , "big kisses" , "money" , "People striking" , "Parents enforcing discipline perhaps" .)