Plant that may be pointed out in the desert (6)
I believe the answer is:
cactus
'plant' is the definition.
(cactus is a kind of plant)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for cactus that I've seen before include "Spiny desert plant" , "Plant found in dry places" , "Spiky desert plant" , "Eg, prickly pear" , "Spiney plant of dry areas" .)