Target of a plumber's snake (4)
I believe the answer is:
clog
'target of a plumber's snake' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for clog that I've seen before include "Congest" , "Obstruct the wooden shoe" , "Dutch shoe" , "Block up - type of shoe" , "Block; sabot" .)