To convert to money, Adam’s son quietly goes in (4,2)
I believe the answer is:
cash in
'to convert to money' is the definition.
I can't judge whether this defines the answer.
'adam's son quietly goes in' is the wordplay.
'adam's son' becomes 'cain' (biblical figure).
'quietly' becomes 'sh'.
'goes in' indicates putting letters inside.
'cain' going around 'sh' is 'CASH IN'.
Can you help me to learn more?
(Other definitions for cash in that I've seen before include "Take advantage of" , "Make money" , "Exchange for money; seize an advantage" , "what piggy bank has?" , "Realise" .)