Mary judges cake with fruit (5)
I believe the answer is:
berry
'fruit' is the definition.
(I know that berry is a type of fruit)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for berry that I've seen before include "Romeo's family" , "Word linking black or blue" , "Small succulent fruit" , "Small round stoneless fruit, may be black (5)" , "Pulpy edible fruit" .)