Get tough (7)

I think it could be either:

Which length description are you looking for?:

3,5

coarsen

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

This is all the clue.

(Other definitions for coarsen that I've seen before include "become inferior" , "Become rough or insensitive" , "Make rougher" , "Dull" , "Make more harsh" .)

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