Plants gun if deception is required (5)

I believe the answer is:

fungi

I'm a little stuck... Click here to teach me more about this clue!

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

'gun if deception is required' is the wordplay.
'gun if' can be anagrammed to 'FUNGI'.
But, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for fungi that I've seen before include "Spore producers" , "life in woodland?" , "Plants like mushrooms and toadstools" , "Magic mushrooms perhaps" , "chanterelles etc" .)

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

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