Party chief's area of knowledge (6)

I believe the answer is:

domain

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'area of knowledge' is the definition.
'domain' can be an answer for 'area' (synonyms). I am not certain of the 'of knowledge' bit.

'party chief's' is the wordplay.
'party' becomes 'do' (do is a kind of party).
'chief' becomes 'main' (synonyms).
'do'+'main'='DOMAIN'

Can you help me to learn more?

(Other definitions for domain that I've seen before include "Sphere or territory" , "Territory over which someone reigns" , "Special region, area of expertise" , "Kingdom or realm" , "Scope of knowledge - owned land" .)

I've seen this clue in The Guardian.

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