Scientist (9)
'scientist' is the definition.
(I know that physicist is a type of scientist)
This is the entire clue.
(Other definitions for physicist that I've seen before include "One studying the nature of matter" , "To become a scientist, doctor gets a name change to the street" , "Expert in the science of matter and energy" .)
'scientist' is the definition.
(boffin can informally mean a scientist)
This is the entire clue.
(Other definitions for boffin that I've seen before include "Military scientist" , "Scientist (sl.)" , "Scientist (in the back room?)" , "(Government) scientist" , "Research scientist" .)