Like some alloying — city police hypersensitive, we hear (11)

'like' is the definition.
Both the answer and definition are adjectives.
Maybe there's an association between them I don't understand?

'some alloying city police hypersensitive we hear' is the wordplay.
I cannot quite see how this works, but
'some' could be 'a' and 'a' is located in the answer.
'city' could be 'ur' (ancient Sumerian city state) and 'ur' is located in the answer.
'police' could be 'met' (London Metropolitan Police) and 'met' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?