Crossword Genius

US chemist rotated screen, extracting middle substance (8)

Ross

I believe the answer is:

druggist

'us chemist' is the definition.
('druggist' is a US term for a pharmacist)

'extracting middle substance' is the wordplay.
'extracting middle' becomes 'drug' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'substance' becomes 'gist' (synonyms).
'drug'+'gist'='DRUGGIST'

'rotated screen' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.

(Another definition for druggist that I've seen is " Pharmacist (US)".)

I've seen this clue in The Guardian.
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