Stolen marijuana at head office is a controversial issue (3,6)
I believe the answer is:
hot potato
'a controversial issue' is the definition.
(I've seen this before)
'stolen marijuana at head office' is the wordplay.
'stolen' becomes 'hot' (stolen goods are 'hot').
'marijuana' becomes 'pot' (slang term for marijuana).
'head' suggests taking the first letters.
The initial letter of 'office' is 'o'.
'hot'+'pot'+'at'+'o'='HOT POTATO'
'is' is the link.
(Other definitions for hot potato that I've seen before include "Difficult matter" , "Problem that's painful to grasp" , "thorny problem" , "contentious question" , "Spot" .)