Revolutionary figure, one about to entertain team (5)
I believe the answer is:
ixion
'revolutionary figure' is the definition.
(figure made to revolve on a wheel in Greek myth)
'one about to entertain team' is the wordplay.
'one' becomes 'I' (Roman numeral).
'about to' becomes 'on' (I've seen this in other clues).
'entertain' means one lot of letters goes inside another.
'team' becomes 'xi' (eleven, a football team).
'i'+'on'='ion'
'ion' going around 'xi' is 'IXION'.
(Other definitions for ixion that I've seen before include "Long-suffering mythical king" , "King bound by Zeus to a turning wheel" , "Legendary king" , "He was bound to go round endlessly" , "king who suffered perpetual revolution" .)