Source of cutting gear and machinery (5)
I believe the answer is:
plant
This clue is a double definition.
'source of cutting' is the first definition.
(a cutting can be taken from a plant)
'gear and machinery' is the second definition.
(Other definitions for plant that I've seen before include "that goes to pot" , "Put in the ground to grow" , "Growing organism - industrial buildings" , "Snooker shot; factory" , "Factory; organism" .)