Southern pie nut (5)
I believe the answer is:
pecan
'southern 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 "Nutty type" , "Species of hickory - edible nut" , "Something like a walnut" , "Type of nut" , "nut-tree" .)