Crazy for almonds, say (4)
I believe the answer is:
nuts
This clue is a double definition.
'crazy' is the first definition.
(nuts can informally mean crazy or mad)
'almonds say' is the second definition.
(almond is a kind of nut)
'for' is the link.
(Other definitions for nuts that I've seen before include "Fruit with edible kernel" , "Is butter" , "Unbalanced" , "Hard shells with edible kernels" , "Potty" .)