Crossword Genius

Thus left a note (3)

Ross

I believe the answer is:

sol

'a note' is the definition.
(I've seen this before)

'thus left' is the wordplay.
'thus' becomes 'so' (synonyms).
'left' becomes 'l' (common abbreviation).
'so'+'l'='SOL'

(Other definitions for sol that I've seen before include "Spanish and poetic sun" , "The Sun (or Campbell?)" , "Fifth note of scale" , "Note, old french coin" , "The sun in Spain" .)

I've seen this clue in the Evening Standard.
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