Compere now introduces Her Majesty (9)
I believe the answer is:
presenter
'compere' is the definition.
(I've seen this before)
'now introduces her majesty' is the wordplay.
'now' becomes 'present' (I've seen this before).
'introduces' says to put letters next to each other.
'her majesty' becomes 'er' (Elizabeth Regina).
'present'+'er'='PRESENTER'
(Other definitions for presenter that I've seen before include "Compere" , "TV person" , "anchor?" , "Broadcast introducer" , "TV/radio introducer" .)