New York borough’s to go with Chief’s address to parliament (6,6)
I believe the answer is:
queens speech
'address to parliament' is the definition.
I can't judge whether this definition defines the answer.
'new york borough's to go with chief's' is the wordplay.
'new york borough' becomes 'queens' (I've seen this in another clue).
'to go with' becomes 'spee' (I am not sure about this - if you are sure you should believe this answer much more).
'chief' becomes 'ch' (abbreviation).
'queens'+'spee'+'ch'='QUEENS SPEECH'
Can you help me to learn more?
(Other definitions for queens speech that I've seen before include "25th December delivery" , "Parliamentary address" , "Correct English" , "Subjects annually addressed in this" , "Parliamentary oration" .)