Robert invests million: is it mine? (4)
I believe the answer is:
bomb
'mine?' is the definition.
(I've seen this before)
'robert invests million' is the wordplay.
'robert' becomes 'bob' (short for Robert).
'invests' means one lot of letters goes inside another (inserted letters are invested).
'million' becomes 'm' (abbreviation).
'bob' placed around 'm' is 'BOMB'.
'is it' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for bomb that I've seen before include "Failure" , "Big bucks - flop" , "worn-out car" , "One set off" , "lot of money" .)