Crossword Genius

University replaces faculty's third head (5)

Ross

I believe the answer is:

skull

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'head' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

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(Other definitions for skull that I've seen before include "Cranium" , "brains here" , "Bony part of head" , "Enclosure for the brain" , "Head bone" .)

I've seen this clue in The Independent.
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