Blotched (7)
I believe the answer is:
mottled
'blotched' is the definition.
('mottle' can be a synonym of 'blotch')
This is all the clue.
(Other definitions for mottled that I've seen before include "Blotchy" , "Having blotches of colour" , "Blotched" , "Marked with streaks or blotches" , "with variable effect" .)