Classy worker, the kind that's royal? (6)

I believe the answer is:

sorter

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'classy worker' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

'the kind that's royal?' is the wordplay.
'the kind' becomes 'sort' ('sort' can be a synonym of 'kind').
'that's royal?' becomes 'er' (abbreviation for Elizabeth Regina).
'sort'+'er'='SORTER'

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