Accustom (5)

I believe the answer is:

inure

'accustom' is the definition.
(inuring is a kind of accustoming)

This is the entire clue.

(Other definitions for inure that I've seen before include "Harden or season" , "Cause to become hardened to" , "Temper, toughen" , "Steel" , "Come to accept" .)

I've seen this clue in The Wall Street Journal, The Washington Post, The Mirror, the Evening Standard, The Sunday Times, the Penny Press, the King Feature Syndicate, The Times and the Sydney Morning Herald.

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