Disease spreading in popular resort area? (7)
I believe the answer is:
seaside
'popular resort area?' is the definition.
(I've seen this before)
'disease spreading' is the wordplay.
'spreading' is an anagram indicator.
'disease' anagrammed gives 'SEASIDE'.
'in' is the link.
(Other definitions for seaside that I've seen before include "Shore - disease (anag)" , "By the briny" , "Popular resort area" , "Ocean shore" , "Shoreline" .)