Possible Clues:

• Plant an oribi chewed
• Plant of the locust or false acacia genus
• Bird first-rate seen climbing locust tree, perhaps
• Locust tree or false acacia genus
• Deciduous shrub of which there is a species called False Acacia
• Shrub of the false acacia genus
• Crusader's companion overcoming infidels initially with a plant
• Bird with bill twice removed from tree, a false one
• Cousins, perhaps, initially insisted aunt should be given a shrub