Crossword Genius

Quit wasting good dope! (5)

Ross

I believe the answer is:

resin

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This could be a double definition.

'quit wasting' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'good dope' is the second definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

Can you help me to learn more?

(Other definitions for resin that I've seen before include "Plant exudation" , "Myrrh, for instance" , "Synthetic compound" , "stuff that's sticky" , "frankincense, for instance?" .)

I've seen this clue in The Independent.
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