A vault where love doctor hides nuclear device (4,4)

I believe the answer is:

atom bomb

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

'a vault where love doctor hides' is the wordplay.
'vault where' becomes 'tomb' (I've seen this before. I am not sure about the 'where' bit.).
'love' becomes 'o' (love means zero in tennis).
'doctor' becomes 'MB' (abbreviation for Bachelor of Medicine).
'hides' means one lot of letters goes inside another (some letters hide inside others).
'o'+'mb'='omb'
'tomb' enclosing 'omb' is 'tombomb'.
'a'+'tombomb'='ATOM-BOMB'

Can you help me to learn more?

(Other definitions for atom bomb that I've seen before include "Explosive device" , "Big weapon" , "It would deter" , "Explosive causing huge cloud" , "The first one fell on Hiroshima" .)

I've seen this clue in The Irish Times.

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