Periodical fiend managed to have one expanded (9)

I believe the answer is:

magnified

'expanded' is the definition.
(thesaurus)

'periodical fiend managed to have one' is the wordplay.
'periodical' becomes 'mag' (abbreviation for magazine).
'managed' is an anagram indicator.
'to have' indicates putting letters inside.
'one' becomes 'I' (Roman numeral).
'fiend' is an anagram of 'nifed'.
'nifed' going around 'i' is 'nified'.
'mag'+'nified'='MAGNIFIED'

(Another definition for magnified that I've seen is " Enlarged or amplified".)

I've seen this clue in The Daily Express.

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