He's crazy for vegetarian food (3)
I believe the answer is:
nut
This could be a double definition.
'he's crazy' is the first definition.
'nut' can be an answer for 'crazy' (I've seen this before). I'm not sure about the 'he's' bit.
'vegetarian food' is the second definition.
(I've seen this before)
'for' is the link.
Can you help me to learn more?
(Other definitions for nut that I've seen before include "Vegetarian food" , "Mechanical fastener" , "Butt" , "Head; hard fruit" , "Lover < or partner to bolt f" .)