Crossword Genius

Singer replacing tenor with soprano too (4)

Ross

I believe the answer is:

also

'too' is the definition.
(synonyms)

I cannot understand how the rest of the clue works.

(Other definitions for also that I've seen before include "'Besides, moreover (4)'" , "What's more" , "To boot" , "Old" , "in accompaniment" .)

I've seen this clue in The Independent.
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