An amount of poison directed at team, Guardiola's team (8)

I believe the answer is:

toxicity

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'an amount of poison' is the definition.
I can't tell whether this definition defines the answer.

'directed at team guardiola's team' is the wordplay.
'directed at' becomes 'to'.
'team' becomes 'xi' (eleven, a football team).
'guardiola's team' becomes 'city' (I can't explain this - if you can you should believe this answer much more).
'to'+'xi'+'city'='TOXICITY'

Can you help me to learn more?

(Other definitions for toxicity that I've seen before include "Strength of poison" , "Deadly strength" , "Dangerous condition" .)

I've seen this clue in The Independent.

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