Crossword Genius

Plants contributing to atmospheric activity (5)

Ross

I believe the answer is:

cacti

'plants' is the definition.
(cactus is a kind of plant)

'contributing to atmospheric activity' is the wordplay.
'contributing to' indicates a hidden word.
'CACTI' can be found hidden inside 'atmospheric activity'.

(Other definitions for cacti that I've seen before include "Tough plants" , "Prickly types" , "they shoot in the desert" , "Prickly Pears perhaps" , "Spiny desert plants" .)

I've seen this clue in The Telegraph.
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