Crossword Genius

Rule head teacher's announced (9)

Ross

I believe the answer is:

principle

'rule' is the definition.
(principle is a kind of rule)

'head teacher's announced' is the wordplay.
'head teacher' becomes 'principal' ('principal' can be a synonym of 'head teacher').
'announced' shows a homophone (sound like).
'principal' is a homophone of 'PRINCIPLE'.

(Other definitions for principle that I've seen before include "Law of nature, rule of conduct" , "Fundamental truth - moral rule" , "Basic standard" , "Axiom" , "Rule of personal conduct" .)

I've seen this clue in The Telegraph.
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