Crossword Genius

Notices doctor returning without drug and is furious (4,3)

Ross

I believe the answer is:

sees red

I'm a little stuck... Click here to teach me more about this clue!

'without drug and is furious' is the definition.
I can't tell whether this defines the answer.

'notices doctor returning' is the wordplay.
'notices' becomes 'sees' (I've seen this in other clues).
'doctor' becomes 'der' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'returning' says the letters should be written in reverse.
'der' reversed gives 'red'.
'sees'+'red'='SEES RED'

Can you help me to learn more?

(Another definition for sees red that I've seen is " 'Becomes colourfully angry (4,3)'".)

I've seen this clue in The Guardian.
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