Little man keeps million that's mine (4)

I believe the answer is:

bomb

I'm a little stuck... Click here to teach me more about this clue!

'mine' is the definition.
(I've seen this before)

'little man keeps million' is the wordplay.
'little man' becomes 'bob' (I am not sure about the 'little' bit.).
'keeps' means one lot of letters goes inside another.
'million' becomes 'm' (abbreviation).
'bob' placed around 'm' is 'BOMB'.

'that's' is the link.

Can you help me to learn more?

(Other definitions for bomb that I've seen before include "packet" , "Unpleasant surprise" , "See 18" , "(Of a theatre production) fail badly" , "One going off" .)

I've seen this clue in The Sun.

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