Oval nut (5)
I believe the answer is:
pecan
'oval 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 "nut-tree" , "Pinkish-brown nut used in American pie" , "Something like a walnut" , "Type of nut" , "of nuts" .)