Crossword Genius

Ring up about special work (4)

Ross

I believe the answer is:

opus

'work' is the definition.
(an opus is an artistic work)

'ring up about special' is the wordplay.
'ring' becomes 'o' (letter resembling a ring).
'about' says the letters should be written backwards.
'special' becomes 'S' (common abbreviation as in Special Air Service).
'up' in reverse letter order is 'pu'.
'o'+'pu'+'s'='OPUS'

(Other definitions for opus that I've seen before include "Major work" , "Composition - magnum __" , "A Latin work" , "(Numbered) musical composition" , "Work (of a composer?)" .)

I've seen this clue in The Independent.
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