Delight in revolutionary online story? (5)
I believe the answer is:
elate
'delight' is the definition.
(I've seen this in another clue)
'revolutionary online story?' is the wordplay.
'revolutionary' is a reversal indicator (letters revolve around).
'online' becomes 'e' (abbreviation for electronic, e.g. in ecommerce).
'story?' becomes 'tale' ('tale' can be a synonym of 'story').
'e'+'tale'='etale'
'etale' back-to-front is 'ELATE'.
'in' acts as a link.
(Other definitions for elate that I've seen before include "Delight" , "Overjoy" , "Make ecstatically happy" , "Make delighted or proud" , "Fill with high spirits" .)