Cool solar area in holiday resort (7)
I believe the answer is:
sunspot
I believe this is a double definition.
'cool solar area' is the first definition.
(I've seen this before)
'holiday resort' is the second definition.
(I've seen this before)
'in' is the link.
(Other definitions for sunspot that I've seen before include "warm place" , "Cool solar area" , "cause of magnetic storm" , "Solar dark patch" , "Solar cool patch" .)