Spiny Mediterranean plant with edible flower buds (5)
(Other definitions for olive that I've seen before include "Greyish-green; fruit" , "yellowish green" , "I love this fruit" , "Cocktail fruit" , "Yellowy-green colour and fruit" .)
(Other definitions for caper that I've seen before include "Lark" , "Skip/dance about" , "Escapade with an edible bud?" , "Recap about prank" , "Frolic - bud used in cooking" .)