Treat with discretion (8)
I believe the answer is:
delicacy
I believe this clue is a double definition.
'treat' is the first definition.
('delicacy' can be a synonym of 'treat')
'discretion' is the second definition.
('delicacy' can be a synonym of 'discretion')
'with' is the link.
(Other definitions for delicacy that I've seen before include "expensive food" , "Treat" , "chef's special?" , "Weakness" , "Culinary luxury" .)