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 unsure of the 'sports' bit.

'in red square naturally' is the wordplay.
'in' says the answer is hidden in the clue.
'ARENA' is hidden in the letters of '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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