Crossword Genius

Hire a map-maker? (7)

Ross

I believe the answer is:

charter

I'm a little stuck... Click here to teach me more about this clue!

'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" .)

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