Ipecac tincture contains desert plants (5)

I believe the answer is:

cacti

'desert plants' is the definition.
(I've seen this before)

'ipecac tincture contains' is the wordplay.
'contains' says the answer is hidden in the clue.
'CACTI' can be found hidden inside 'ipecac tincture'.

(Other definitions for cacti that I've seen before include "Tough plants" , "Plants of dry regions" , "Prickly plants" , "They're decidedly prickly" , "Leafless succulents" .)

I've seen this clue in The Guardian.

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