Head's idle (4)

I believe the answer is:

loaf

I believe this clue is a double definition.

'head's' is the first definition.
(slang term for the head)

'idle' is the second definition.
(loafing is a kind of idling)

(Other definitions for loaf that I've seen before include "Bread; loiter" , "Piece of bread" , "Head - bread" , "Spend time idly; bread" , "Be idle; something baked" .)

I've seen this clue in The Telegraph.

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