### Clue: Its giant 11's toxic in corner pot (7)
### Answer: HOGWEED 
 ### Explanation: Definition: Its giant 11's toxic
 HOG(to corner;to take more than one's share of) + WEED(like "pot", another slang word for marijuana).
Answer: The giant hogweed, a phototoxic plant, is a species (answer to 11 across) of the genus, hogweed.