Lot to do as, running wild, this can be poisonous (9)

I believe the answer is:

toadstool

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'wild this can be poisonous' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'lot to do as running' is the wordplay.
'running' is an anagram indicator.
'lot'+'to'+'do'+'as'='lottodoas'
'lottodoas' with letters rearranged gives 'TOADSTOOL'.

Can you help me to learn more?

(Other definitions for toadstool that I've seen before include "Fungal growth" , "that could be poisonous" , "Poisonous fungus" , "Common fungus" , "what's poisonous maybe" .)

I've seen this clue in The Telegraph.

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