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Princess penning a recipe, which may involve chops (6)

Ross

I believe the answer is:

karate

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'princess penning a recipe which may involve chops' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'princess penning a recipe' is the wordplay.
'princess' becomes 'kate' (Duchess of Cambridge, born Kate Middleton).
'penning' means one lot of letters goes inside another.
'recipe' becomes 'r' (abbreviation in medical prescriptions).
'a'+'r'='ar'
'kate' going around 'ar' is 'KARATE'.

Can you help me to learn more?

(Other definitions for karate that I've seen before include "Martial art (with chopping?)" , "SPORT/GAME" , "Japanese system of unarmed combat" , "fighting system" , "Combative sport" .)

I've seen this clue in The Guardian.
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