Concealed; made indistinct (8)
I believe the answer is:
obscured
I believe this is a double definition.
'concealed' is the first definition.
(obscuring is a kind of concealing)
'made indistinct' is the second definition.
('obscure' can be a synonym of 'make indistinct')
(Other definitions for obscured that I've seen before include "Overshadowed or eclipsed" , "Hid from view" , "unnoticed" , "Veiled, hidden" , "Good news from clinic about schoolboy no longer" .)