Flaw (6)
'flaw' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for blemish that I've seen before include "Disfigurement" , "bad mark?" , "Stain, flaw" , "A flaw or imperfection" , "acne?" .)
'flaw' is the definition.
(I know that flaw can be written as defect)
This is the entire clue.
(Other definitions for defect that I've seen before include "Transfer allegiance to opposition" , "Join opponents in a cause" , "Desert - flaw" , "weakness" , "Flaw - change sides" .)
'flaw' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for imperfection that I've seen before include "Fault, flaw" , "Blemish" , "Failing" .)
(Other definitions for fatal that I've seen before include "Unavoidable" , "very bad for health!" , "Disastrous, maybe lethal" , "Causing death, say accident" , "Involving death" .)