How you get that job in terra firma? (4)

I believe the answer is:

land

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'terra firma?' is the definition.
(I know that terra firma can be written as land)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for land that I've seen before include "Come down to earth" , "German region" , "Come down; country" , "See 3" , "Lift with ropes and pulleys" .)

I've seen this clue in the Evening Standard.

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