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 Times, The Mirror, the Penny Press, the Evening Standard, the King Feature Syndicate, The Sunday Times, The Wall Street Journal, the Sydney Morning Herald and The Washington Post.

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