Appear indistinctly (4)
I believe the answer is:
loom
'appear indistinctly' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for loom that I've seen before include "Hang menacingly (over)" , "See 12" , "Weaving instrument" , "Appear indistinctly, in threatening form" , "Mill machinery" .)