Controversial topic (3,6)
I believe the answer is:
hot potato
'controversial topic' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for hot potato that I've seen before include "tricky issue?" , "Topical, dangerous, issue" , "Contentious issue" , "Troublesome situation for spicy spud" , "Difficult matter" .)