Dare nations conceal a battle ground? (5)

I believe the answer is:

arena

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

'a battle ground?' is the definition.
'arena' can be an answer for 'ground?' (I've seen this before). I am unsure of the 'a battle' bit.

'dare nations conceal' is the wordplay.
'conceal' indicates the answer is hidden within the clue.
'ARENA' is hidden within 'dare nations'.

Can you help me to learn more?

(Other definitions for arena that I've seen before include "Entertainments venue" , "Area of activity, boxing perhaps" , "Gladiatorial ring" , "Place for public events" , "Space for public events" .)

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