Summer cooler
I believe the answer is:
fan
'summer cooler' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for fan that I've seen before include "Aficionado" , "Cooling device for enthusiastic supporter" , "Cooling device for an ardent supporter" , "Manual cooling device - for admirer?" , "Ardent admirer" .)