Crossword Genius

Deteriorates and becomes a drug-taker (4,2,3)

Ross

I believe the answer is:

goes to pot

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'deteriorates' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

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(Other definitions for goes to pot that I've seen before include "Prepares to follow snooker player" , "Become ruined" , "loses form" , "cracks up" , "Approaches the snooker table" .)

I've seen this clue in The Globe and Mail.
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