Map with royal residence and public school (12)
I believe the answer is:
charterhouse
'public school' is the definition.
(I've seen this before)
'map with royal residence' is the wordplay.
'map' becomes 'chart' (chart is a kind of map).
'with royal' becomes 'er' (I've seen this in other clues. I am not sure about the 'with' bit.**).
'residence' becomes 'house' (I've seen this before).
'chart'+'er'+'house'='CHARTERHOUSE'
'and' acts as a link.
Can you help me to learn more?
(Other definitions for charterhouse that I've seen before include "Monastery - public school" , "The - of Parma, novel by Stendhal" .)