Crossword Genius

Commentator's dread for earth (5)

Ross

I believe the answer is:

terra

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

'earth' is the definition.
(thesaurus)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for terra that I've seen before include "Dry land" , "Land (Latin)" , "Centre" , "Legally land" , "-- Firma; -- incognita" .)

I've seen this clue in the Sydney Morning Herald.
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