School leader hides master's blunders (12)

I believe the answer is:

headmistress

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'school leader' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'hides master's blunders' is the wordplay.
'blunders' indicates anagramming the letters.
'hides'+'masters'='hidesmasters'
'hidesmasters' anagrammed gives 'HEADMISTRESS'.

Can you help me to learn more?

(Other definitions for headmistress that I've seen before include "Person in charge of a school" , "Female school leader" , "Teacher" , "School principal" .)

I've seen this clue in The Telegraph.

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