Catherine is average, right? (4)

I believe the answer is:

parr

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'catherine' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'average right?' is the wordplay.
'average' becomes 'par' (average score in golf).
'right?' becomes 'R' (common abbreviation).
'par'+'r'='PARR'

'is' acts as a link.

Can you help me to learn more?

(Other definitions for parr that I've seen before include "Katherine --, last wife of Henry VIII" , "survivor of the decapitator?" , "Wife surviving" , "Young salmon with spots" , "Fish" .)

I've seen this clue in the Sydney Morning Herald.

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