Large juicy fruit (5)
(Other definitions for melon that I've seen before include "Sweet juicy gourd" , "Killing" , "Type of pepo" , "Gourdlike fruit" , "Large vine fruit" .)
(Other definitions for pineapple that I've seen before include "Large fleshy fruit with a tuft of stiff leaves" , "Fruit (tree and fruit!)" , "Juicy tropical fruit or slang hand grenade" , "Juicy tropical fruit often sold segmented" , "Fruit grown on ground" .)