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Become rigid (7)

Ross

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6

7

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

This is all the clue.

(Other definitions for stiffen that I've seen before include "Become more rigid" , "Make hard" , "Add starch" , "Make rigid or inflexible" , "more severe" .)

I've seen this clue in the Sydney Morning Herald, The Independent and The Telegraph.
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