Stadium needs an extended time to overhaul (5)
I believe the answer is:
arena
'stadium' is the definition.
(synonyms)
'an extended time to overhaul' is the wordplay.
'extended time' becomes 'era' (era is a kind of time. I am not sure about the 'extended' bit.).
'to overhaul' says the letters should be written in reverse (I've seen 'overhauled' mean this).
'an'+'era'='anera'
'anera' reversed gives 'ARENA'.
'needs' is the link.
Can you help me to learn more?
(Other definitions for arena that I've seen before include "combat zone" , "Wembley, for example" , "Stadium - battlefield" , "Part of a stadium" , "Sporting enclosure" .)