Pie-cooling spot (4)
I believe the answer is:
sill
'pie-cooling spot' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sill that I've seen before include "Mass of rock" , "Shelf at the foot of a window" , "Horizontal intrusion of igneous rock between sedimentaries, as in much of Hadrian's Wall" , "Slab at foot of window" , "Ledge beneath a window" .)