Desert plants (5)
'desert plants' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for cacti that I've seen before include "Spiky desert plants in plural" , "tuna, for example" , "Plants of dry regions" , "Spiny succulent plants" , "Plants native to arid regions" .)
'desert plants' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Another definition for aloes that I've seen is " purgative drug".)