Crossword Genius

American exactitude shown in stiff feature (5)

Ross

I believe the answer is:

rigor

I believe this clue is a double definition.

'american exactitude' is the first definition.
(US spelling of 'rigour')

'stiff feature' is the second definition.
(rigor mortis is shown by a body or 'stiff')

'shown in' acts as a link.

(Other definitions for rigor that I've seen before include "showing failure to respond" , "Stiff, irresponsive state" , "Stiffness (after death?)" , "Muscular cramp" , "Shivering chill before fever" .)

I've seen this clue in The Guardian.
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