Walnut or pecan (3)
I believe the answer is:
nut
This clue is a double definition.
'walnut' is the first definition.
(thesaurus)
'pecan' is the second definition.
(I've seen this in another clue)
(Other definitions for nut that I've seen before include "Hazel; beech" , "One securing bolt" , "eg Pecan" , "Enthusiast (slang)" , "Lover < or partner to bolt f" .)