Almond or cashew, eg (3)
I believe the answer is:
nut
I believe this clue is a double definition.
'almond' is the first definition.
(almond is a type of nut)
'cashew eg' is the second definition.
(cashew is a kind of nut)
(Other definitions for nut that I've seen before include "Large, hard-shelled seed" , "Fruitcake" , "Enthusiast (slang)" , "Hard kernel of minutiae" , "Enthusiastic person" .)