Dylan takes mega sum of money (4)
I believe the answer is:
bomb
'sum of money' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe there's an association between them I don't understand?
'dylan takes mega' is the wordplay.
'dylan' becomes 'bob' (Bob Dylan).
'takes' indicates putting letters inside.
'mega' becomes 'm' (this could be a standard abbreviation I've not previously seen).
'bob' placed around 'm' is 'BOMB'.
Can you help me to learn more?
(Other definitions for bomb that I've seen before include "Explosive weapon" , "See 18" , "lot of money" , "Exploding device" , "Drop" .)