Leader of Tories making cuts, which is difficult (6)
I believe the answer is:
taxing
'difficult' is the definition.
(I've seen this in another clue)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for taxing that I've seen before include "'Not easily borne, very wearing (6)'" , "Physically or mentally demanding" , "Burdensome" , "Making heavy demands, like Revenue Commissioners" , "Onerous" .)