Crossword Genius

Admit rice is rotten – it's fatal for mother (9)

Ross

I believe the answer is:

matricide

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'fatal for mother' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'admit rice is rotten' is the wordplay.
'is rotten' indicates anagramming the letters.
'admit'+'rice'='admitrice'
'admitrice' is an anagram of 'MATRICIDE'.

'it's' is the link.

Can you help me to learn more?

(Other definitions for matricide that I've seen before include "Murderer" , "Diametric killing of a mother" , "The killing of one's mother" , "Murder of one's mother" , "Killer" .)

I've seen this clue in The Guardian.
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