Hire a map-maker? (7)
I believe the answer is:
charter
'hire' is the definition.
(I know that hire can be written as charter)
'a map-maker?' is the wordplay.
'a map' becomes 'chart' (chart is a kind of map).
'maker?' becomes 'er' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'chart'+'er'='CHARTER'
Can you help me to learn more?
(Other definitions for charter that I've seen before include "Written constitution" , "Contract to lease transportation" , "Let or hire a ship or plane" , "Written grant; hire" , "Hire a boat or aircraft" .)