One of those small producers of silk suspenders (6)
I believe the answer is:
spider
'one' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for spider that I've seen before include "Web developer" , "Cue rest; arachnid" , "A crawler" , "Creator of web" , "Member of arachnid family" .)