Crossword Genius

Swedish scientist is retired tennis champion (7)

Ross

I believe the answer is:

sievert

'swedish scientist' is the definition.
(physicist Rolf Sievert)

'is retired tennis champion' is the wordplay.
'retired' is a reversal indicator.
'tennis champion' becomes 'evert' (I've seen this before).
'is' in reverse letter order is 'si'.
'si'+'evert'='SIEVERT'

(Other definitions for sievert that I've seen before include "Swedish physicist" , "Measure of radiation dose" , "Physics unit" .)

I've seen this clue in The Guardian.
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