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

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