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Father maps out terrain (6)

Ross

I believe the answer is:

pampas

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'terrain' is the definition.
The definition and answer can be both locations as well as being singular nouns.
Maybe there's a link between them I don't understand?

'father maps out' is the wordplay.
'father' becomes 'pa' (pa can mean dad or father).
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'maps' anagrammed gives 'mpas'.
'pa'+'mpas'='PAMPAS'

Can you help me to learn more?

(Other definitions for pampas that I've seen before include "South American plain" , "South American prairie" , "South American plains" , "part of South America" , "South American grassland" .)

I've seen this clue in The Mirror.
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