Suspect disease in coastal area (7)
I believe the answer is:
seaside
'coastal area' is the definition.
(I've seen this before)
'suspect disease' is the wordplay.
'suspect' is an anagram indicator (a suspicious or unusual spelling).
'disease' is an anagram of 'SEASIDE'.
'in' acts as a link.
(Other definitions for seaside that I've seen before include "Beach holiday resort area" , "By the briny" , "Popular resort area" , "A place on the coast" , "Beach location" .)