Our planet (5)

I think it could be either:

earth

terra

'our planet' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for earth that I've seen before include "Soil; ground terminal" , "cost of which is very high" , "Our favourite planet" , "costs so much?" , "hideaway" .)

I've seen this clue in The Sun, the Newsday, The Mirror, The Telegraph, the Penny Press, The Star Tribune, the Evening Standard, the USA Today and the Sydney Morning Herald.

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