Rely on revolution for finance (8)
I believe the answer is:
bankroll
'finance' is the definition.
(I've seen this before)
'rely on revolution' is the wordplay.
'rely' becomes 'bank'.
'on' is a charade indicator (letters next to each other).
'revolution' becomes 'roll' ('roll' can be a synonym of 'revolution').
'bank'+'roll'='BANKROLL'
'for' acts as a link.
(Other definitions for bankroll that I've seen before include "keep afloat?" , "Fund" , "Provide finance for" .)