Is Israel concerned with splitting element for source of power? (7,7)

I believe the answer is:

fission reactor

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

'source of power?' is the definition.
The definition suggests a singular noun which matches the answer.

'is israel concerned with splitting element for' is the wordplay.
'israel' becomes 'sion' (I've seen this in other clues).
'concerned with' becomes 're' (re can mean regarding or about).
'splitting' is an insertion indicator (some letters split a word into two).
'element for' becomes 'factor' (I can't justify this - if you can you should believe this answer much more).
'is'+'sion'+'re'='issionre'
'issionre' placed into 'factor' is 'FISSION REACTOR'.

Can you help me to learn more?

(Another definition for fission reactor that I've seen is " nuclear installation".)

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.