Sports field - in Red Square naturally (5)

I believe the answer is:

arena

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

'sports field' is the definition.
'arena' can be an answer for 'field' (synonyms). I'm not sure about the 'sports' bit.

'in red square naturally' is the wordplay.
'in' indicates a hidden word.
'ARENA' can be found hidden inside 'red square naturally'.

Can you help me to learn more?

(Other definitions for arena that I've seen before include "Wembley, for example" , "The place of action" , "domain" , "Ring; stadium" , "Place of combat" .)

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