Stiffness of a dead body (5,6)

I believe the answer is:

rigor mortis

(Other definitions for rigor mortis that I've seen before include "Rigidity of a dead body" , "Stiffening after death" , "Stiffness in dead body" , "Stiffness that sets in after death" , "Stiffening of a corpse" .)

I've seen this clue in the Sydney Morning Herald.

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