What could be DC Andy Walterson’s workplace? (3,8,4)

I believe the answer is:

new scotland yard

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'workplace?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'what could be dc andy walterson's' is the wordplay.
'what could be' indicates an anagram.
'dc'+'andy'+'walterson'='dcandywalterson'
'dcandywalterson' with letters rearranged gives 'NEW SCOTLAND YARD'.

Can you help me to learn more?

(Other definitions for new scotland yard that I've seen before include "police HQ" , "A place for pigs!" .)

I've seen this clue in The Times.

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