It may be pointed out in the desert (6)

I believe the answer is:

cactus

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'it may be pointed out in the desert' is the definition.
The definition suggests a singular noun which matches the answer.

This is all the clue.

Can you help me to learn more?

(Other definitions for cactus that I've seen before include "Desert flower" , "Often prickly succulent plant native to arid regions" , "Prickly sort" , "Spiny desert plant" , "Eg, prickly pear" .)

I've seen this clue in The Globe and Mail.

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