Exercise machine (9)
I believe the answer is:
appliance
'machine' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for appliance that I've seen before include "Machine, piece of equipment" , "food mixer, perhaps" , "Domestic machine" , "Washing machine or toaster, say" , "Machine (for use in the home)" .)