Crossword Genius

An age's rising ground (5)

Ross

I believe the answer is:

arena

'ground' is the definition.
(I've seen this before)

'an age's rising' is the wordplay.
'age' becomes 'era' (both can mean a long time).
'rising' says the letters should be written in reverse (going up in a down clue).
'an'+'era'='anera'
'anera' in reverse letter order is 'ARENA'.

(Other definitions for arena that I've seen before include "Sporting enclosure" , "Venue for contests" , "Area of combat" , "Ring; stage" , "Place of activity, especially conflict" .)

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