Crossword Genius

To become inflexible in habits or attitudes (6)

Ross

I believe the answer is:

ossify

(Other definitions for ossify that I've seen before include "Solidify; turn into bone" , "Change into bone, or become unprogressive" , "Become hard and bony with age" , "Convert into bone" , "become inflexible" .)

I've seen this clue in The Sunday Times and The Times.
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