Crossword Genius

Shattering discovery in Moab tomb (4,4)

Ross

I believe the answer is:

atom bomb

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

'shattering discovery' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

'moab tomb' is the wordplay.
'moab tomb' anagrams to 'ATOM BOMB'.
But, I am not clear how the anagram is indicated.

'in' is the link.

Can you help me to learn more?

(Other definitions for atom bomb that I've seen before include "Destructive weapon" , "Weapon of mass destruction" , "Big weapon" , "The first one fell on Hiroshima" , "Explosive causing huge cloud" .)

I've seen this clue in The Globe and Mail.
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