Crossword Genius

Nuclear weapon made from improbable explosion, disregarding peril (5)

Ross

I believe the answer is:

abomb

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

'nuclear weapon' is the definition.
'abomb' can be an answer for 'weapon' (I've seen this before). I am not sure about the 'nuclear' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Another definition for abomb that I've seen is " weapon".)

I've seen this clue in The Irish Independent.
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