Blight that I spotted, say (7)
I believe the answer is:
eyesore
'blight' is the definition.
(I've seen this before)
'i spotted say' is the wordplay.
'i' becomes 'eye' (I've seen this in other clues).
'spotted' becomes 'saw' (spot can mean to see).
'say' indicates a 'sounds like' (homophone) clue.
'saw' is a homophone of 'sore'.
'eye'+'sore'='EYESORE'
'that' is the link.
(Other definitions for eyesore that I've seen before include "Ugly object, hard on the sight" , "pigsty" , "Something ugly to look at" , "mess" , "terrible prospect" .)