Some printed text allowed by Queen in the public notice (10)
I believe the answer is:
letterhead
'some printed text' is the definition.
'allowed by queen in the public notice' is the wordplay.
'allowed' becomes 'let' (to let is to allow or permit).
'by' is a charade indicator (letters next to each other).
'queen' becomes 'ER' (abbreviation for Elizabeth Regina).
'in' indicates putting letters inside.
'public notice' becomes 'ad' (short for advertisement).
'er' put into 'the' is 'terhe'.
'let'+'terhe'+'ad'='LETTERHEAD'
(Other definitions for letterhead that I've seen before include "Heading on stationery" , "Address, name etc printed at top of notepaper" , "Where name and address are shown" , "Printed address on stationery" , "Preprinted name, address etc at top of notepaper" .)