Crossword Genius

Where chefs work boy restrains urge (7)

Ross

I believe the answer is:

kitchen

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'where chefs work' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'boy restrains urge' is the wordplay.
'boy' becomes 'ken' ().
'restrains' indicates putting letters inside.
'urge' becomes 'itch' (I've seen this before).
'ken' placed around 'itch' is 'KITCHEN'.

Can you help me to learn more?

(Other definitions for kitchen that I've seen before include "Where heat's to be stood" , "Room - thicken (anag)" , "Room with cooking facilities" , "Site of 4 [GAS OVEN]" , "In workplace" .)

I've seen this clue in The Sun.
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