List a resort as irregular (6)

I believe the answer is:

roster

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'list' is the definition.
(roster is a kind of list)

'a resort as irregular' is the wordplay.
'resort' anagrams to 'ROSTER'.
Though, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for roster that I've seen before include "Work rota" , "Work list" , "Roll" , "Schedule" , "Duty plan" .)

I've seen this clue in the Evening Standard.

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