Crossword Genius

Nuclear reaction (7)

Ross

I believe the answer is:

fission

'nuclear reaction' is the definition.
(fission is a kind of nuclear reaction)

This is the entire clue.

(Other definitions for fission that I've seen before include "Nuclear reaction" , "So is fin (anag.)" , "Atom-splitting" , "Nuclear splitting" , "Splitting (of e.g. nucleus)" .)

I've seen this clue in The Independent.
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