Violent storm not on in Wagnerian series? (5)
I believe the answer is:
cycle
'wagnerian series?' is the definition.
(I've seen this before)
'violent storm not on' is the wordplay.
'violent storm' becomes 'cyclone' (cyclone is a kind of violent storm).
'not' is a deletion indicator.
'cyclone' with 'on' taken away is 'CYCLE'.
'in' is the link.
(Other definitions for cycle that I've seen before include "Series of events; bike" , "Sequence of events that repeats" , "Regularly repeated sequence (of events)" , "Revolution - form of transport" , "Series of works; bike" .)