Angry, I cool off in the head's study (10)

I believe the answer is:

craniology

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'the head's study' is the definition.
The definition suggests a singular noun which matches the answer.

'angry i cool off' is the wordplay.
'off' indicates anagramming the letters.
'angry'+'i'+'cool'='angryicool'
'angryicool' with letters rearranged gives 'CRANIOLOGY'.

'in' acts as a link.

Can you help me to learn more?

I've seen this clue in The Telegraph.

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