Crossword Genius

A professional stand-in (5)

Ross

I believe the answer is:

locum

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This clue might be a double definition.

'a professional' is the first definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'stand-in' is the second definition.
(I know that locum is a type of stand-in)

Can you help me to learn more?

(Other definitions for locum that I've seen before include "Stand-in, for a doctor say" , "Stand-in physician" , "Doctor's temporary replacement" , "Professional who stands in for another" , "Medical temp?" .)

I've seen this clue in the Evening Standard.
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