Crossword Genius

Mouthy thing elected Conserv­ative — is nothing right? (7)

Ross

I believe the answer is:

incisor

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'mouthy thing' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'elected conservative is nothing right?' is the wordplay.
'elected' becomes 'in' (in government).
'conservative' becomes 'C' (UK political abbreviation).
'nothing' becomes 'O' (O resembles 0).
'right?' becomes 'r' (abbreviation).
'in'+'c'+'is'+'o'+'r'='INCISOR'

Can you help me to learn more?

(Other definitions for incisor that I've seen before include "something with bite" , "companion could be Goofy" , "cutter" , "One takes a bite" , "Cutting tooth" .)

I've seen this clue in The Guardian.
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