Standing against British rule where one is stymied by parliament, is it an omnishambles? (4-11)

'standing' is the definition.
Both the definition and answer are singular nouns.
Maybe you can see an association between them that I can't see?

'against british rule where one is stymied by parliament is it an omnishambles?' is the wordplay.
I cannot quite see how this works, but
'against' could be 'anti' (prefix meaning against) and 'anti' is located in the answer.
'rule' could be 'r' (abbreviation for rule) and 'r' is found within the answer.
'one' could be 'i' (Roman numeral) and 'i' is found in the answer.
'is' is present in the answer.
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is located in the answer.
'an' could be 'i' (Roman numeral for one) and 'i' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?