Crossword Genius

Cook particular course, speciality (6)

Ross

I believe the answer is:

domain

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'speciality' is the definition.
(thesaurus)

'cook particular course' is the wordplay.
'cook' becomes 'do' (do can mean to cook).
'particular course' becomes 'main' (main course is a kind of course. I am not sure about the 'particular' bit.).
'do'+'main'='DOMAIN'

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(Other definitions for domain that I've seen before include "Field of thought or activity" , "Range of influence or field of activity" , "estate" , "A district sphere of influence" , "Range of influence or field of thought" .)

I've seen this clue in The Telegraph.
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