Crossword Genius

Doctor gets you improving finally -- prescribing this? (4)

Ross

I believe the answer is:

drug

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

'prescribing this?' is the definition.
The definition suggests a singular noun which matches the answer.

'doctor gets you improving finally' is the wordplay.
'doctor' becomes 'dr' ('Dr' can be a synonym of 'doctor'**).
'gets' says to put letters next to each other.
'finally' says to take the final letters.
The last letters of 'you improving' are 'ug'.
'dr'+'ug'='DRUG'

Can you help me to learn more?

(Other definitions for drug that I've seen before include "Substance used as medicine or narcotic" , "Chemical medicament" , "Sedate" , "Perhaps grass" , "Pharmaceutical (or recreational) item" .)

I've seen this clue in The Telegraph.
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