Atomic device right at core fractured (7)

I believe the answer is:

reactor

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'atomic device' is the definition.
'reactor' can be an answer for 'device' (reactor is a kind of device). I am unsure of the 'atomic' bit.

'right at core fractured' is the wordplay.
'right' becomes 'r' (common abbreviation).
'fractured' indicates an anagram.
'at'+'core'='atcore'
'atcore' anagrammed gives 'eactor'.
'r'+'eactor'='REACTOR'

Can you help me to learn more?

(Other definitions for reactor that I've seen before include "See 3 Down" , "nuclear vessel" , "Apparatus for production of nuclear energy" , "I swing back" , "(Nuclear) powerplant" .)

I've seen this clue in The Sun.

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