Crossword Genius

Sort of ironic about Stimpy's original canine companion (7)

Ross

I believe the answer is:

incisor

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

'canine companion' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'sort of ironic about stimpy's original' is the wordplay.
'sort of' indicates anagramming the letters.
'about' is an insertion indicator.
'original' says to take the initial letters (the origin of the word).
The first letter of 'stimpys' is 's'.
'ironic' with letters rearranged gives 'incior'.
'incior' going around 's' is 'INCISOR'.

Can you help me to learn more?

(Other definitions for incisor that I've seen before include "oral equipment" , "carnivore requires?" , "Narrow-edged tooth" , "something with bite" , "Type of tooth" .)

I've seen this clue in The Guardian.
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