Ian's own? (3)

I believe the answer is:

ain

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'own?' is the definition.
(synonyms)

'ian's' is the wordplay.
'ian' anagrams to 'AIN'.
However, I'm not sure how this is indicated.

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(Other definitions for ain that I've seen before include "Own (Scot)" , "26 [ ]" , "Glaswegian personal" , "The Scot's own" , "Your own in Scottish dialect" .)

I've seen this clue in the Evening Standard.

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