Admit rice is rotten – it's fatal for mother (9)
I believe the answer is:
matricide
'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" .)