Crossword Genius

Junky': guy popping pills (5)

Ross

I believe the answer is:

cheap

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'junky'' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

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(Other definitions for cheap that I've seen before include "Second-rate" , "Mean" , "Budget -cheesy" , "not doing much damage" , "Shoddy" .)

I've seen this clue in The Independent.
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