High street shop where police located queen? (9)
I believe the answer is:
stationer
'high street shop' is the definition.
'where police located queen?' is the wordplay.
'where police located' becomes 'station'.
'queen?' becomes 'er' (abbreviation for Elizabeth Regina).
'station'+'er'='STATIONER'
(Other definitions for stationer that I've seen before include "Seller of paper, pens, etc" , "Writing-materials shop" , "Seller of writing materials" , "bookseller" , "Tears into (anag.)" .)