Weaver's device (4)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
loom
'weaver's device' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for loom that I've seen before include "weaver" , "Weaving instrument" , "Appear large and indistinct, to weave?" , "Apparatus for weaving yarn" , "Textile machine; come into sight" .)