Crossword Genius

Doctor with head buried in a good book prescribes drops (7)

Ross

I believe the answer is:

dribble

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'doctor with' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps there's a link between them I don't understand?

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for dribble that I've seen before include "Flow in a thin stream" , "Use dibbler to manipulate ball cleverly in soccer" , "Salivate" , "Just a bit" , "Emit saliva through lips" .)

I've seen this clue in The Independent.
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