Crossword Genius

So rich doctor formed singing groups (6)

Ross

I believe the answer is:

choirs

'singing groups' is the definition.
(I've seen this before)

'so rich doctor' is the wordplay.
'doctor' indicates anagramming the letters.
'so'+'rich'='sorich'
'sorich' anagrammed gives 'CHOIRS'.

'formed' acts as a link.

(Other definitions for choirs that I've seen before include "Groups of singers, in church say" , "Singing groups" , "Groups of singers, often in churches" , "Singing teams" , "Bands of singers" .)

I've seen this clue in the Sydney Morning Herald.
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