One might be painted to blur a line (7)
I believe the answer is:
toenail
'one might be painted' is the definition.
I can't tell whether this defines the answer.
'to blur a line' is the wordplay.
'blur' is an anagram indicator (blur can mean a confusion or mess).
'a'+'line'='aline'
'aline' is an anagram of 'enail'.
'to'+'enail'='TOENAIL'
Can you help me to learn more?
(Other definitions for toenail that I've seen before include "Footplate, perhaps" , "One of ten" , "may need this cut?" , "Digital coverage" , "woman in labour" .)