An age going back to the scene of battle (5)
I believe the answer is:
arena
'the scene of battle' is the definition.
(I've seen this in another clue)
'an age going back' is the wordplay.
'age' becomes 'era' (both can mean a long time).
'going back' says the letters should be written backwards.
'an'+'era'='anera'
'anera' backwards is 'ARENA'.
'to' is the link.
(Other definitions for arena that I've seen before include "Where gladiatorial contests took place" , "Stadium - battlefield" , "Place of public contest" , "Cheap Prom tickets" , "Place of combat" .)