Plan part of Christmas term in detail (10)

I believe the answer is:

mastermind

'plan' is the definition.
(masterminding is a kind of planning)

'part of christmas term in detail' is the wordplay.
'part of' indicates the answer is hidden within the clue.
'MASTERMIND' is hidden within 'christmas term in detail'.

(Other definitions for mastermind that I've seen before include "Person conceiving a project - TV programme" , "Ringleader" , "Criminal planner" , "Be behind" , "Intellectual" .)

I've seen this clue in The Independent.

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