Maybe to move out around November is a bad thing (5)

I believe the answer is:

venom

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

'bad thing' is the definition.
'venom' can be an answer for 'bad' (thesaurus). I am not sure about the 'thing' bit.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for venom that I've seen before include "ill will" , "acrimony" , "Poison - spite" , "Poisonous liquid of snakes" , "Virulence" .)

I've seen this clue in the Evening Standard.

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