Revolutionary helps to inspire cheers arriving at arenas (6)
I believe the answer is:
stadia
'arenas' is the definition.
(plural of 'stadium')
'revolutionary helps to inspire cheers' is the wordplay.
'revolutionary' is a reversal indicator (letters revolve around).
'helps' becomes 'aids' ('aid' can be a synonym of 'help').
'to inspire' means one lot of letters goes inside another (breathe in).
'cheers' becomes 'ta' (both can informally mean thank you).
'aids' in reverse letter order is 'sdia'.
'sdia' enclosing 'ta' is 'STADIA'.
'arriving at' is the link.
(Other definitions for stadia that I've seen before include "Sports grounds" , "Sports arenas" , "major venues" , "Big venues" , "Bowls" .)