Defect (4)
'defect' is the definition.
(I know that defect can be written as blemish)
This is all the clue.
(Other definitions for blemish that I've seen before include "Moral defect or fault" , "Small flaw" , "Stain - defect" , "Flaw; moral defect" , "Flaw that spoils a thing's perfection" .)
'defect' is the definition.
(I know that defect can be written as flaw)
This is the entire clue.
(Other definitions for flaw that I've seen before include "(Make) defect(ive)" , "failing" , "Weakness" , "Error in theory or plan" , "sudden rush" .)
'defect' is the definition.
(I know that defect can be written as fault)
This is all the clue.
(Other definitions for fault that I've seen before include "Defect, mistake" , "Defect; culpability" , "An incorrect serve in tennis" , "Shortcoming" , "Geological strata dislocation" .)