Negative aspect (3)
'negative aspect' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for con that I've seen before include "Tory" , "one in pen?" , "Learn; swindle" , "Deceive; convict (colloq.)" , "Deceive (someone)" .)
'negative aspect' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for downside that I've seen before include "public school" , "Somerset RC abbey/college" , "Negative aspect" , "Discouraging aspect" , "RC school; bad aspect" .)