Is a collector, one understands (7)
I believe the answer is:
gathers
'one understands' is the definition.
(I've seen this before)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for gathers that I've seen before include "Collects in one place" , "Draws together" , "Assembles" , "The rags (anag.)" , "Part of dress" .)