Weaving machine (4)
I believe the answer is:
loom
'weaving machine' is the definition.
(machine for weaving thread)
This is all the clue.
(Other definitions for loom that I've seen before include "Mill machinery" , "Weaving instrument" , "Textile machine for weaving" , "'Appear as a vague form, perhaps threatening (4)'" , "Impend; weaving machine" .)