Explosive little man invests million (4)

I believe the answer is:

bomb

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'explosive' is the definition.
(a bomb is a type of explosive)

'little man invests million' is the wordplay.
'little man' becomes 'bob' (short for Robert. I am not sure about the 'little' bit.).
'invests' is an insertion indicator (inserted letters are invested).
'million' becomes 'm' (abbreviation).
'bob' placed around 'm' is 'BOMB'.

Can you help me to learn more?

(Other definitions for bomb that I've seen before include "charge" , "Exploding device" , "One going off" , "lot of money" , "worn-out car" .)

I've seen this clue in The Sun.

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