Pie nut (5)
I believe the answer is:
pecan
'pie nut' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for pecan that I've seen before include "Walnut-like nut" , "Something like a walnut" , "US nut tree" , "Nutty type" , "Nut with sweet oily kernel" .)