Experience again return of Wicked Queen (6)
I believe the answer is:
relive
'experience again' is the definition.
('live' is an answer for 'experience' so perhaps 'relive' is OK for 'experience again')
'return of wicked queen' is the wordplay.
'return of' shows that the letters should be reversed in order.
'wicked' becomes 'evil' ('evil' is associated in meaning with 'wicked').
'queen' becomes 'er' (abbreviation for Elizabeth Regina).
'evil'+'er'='eviler'
'eviler' in reverse letter order is 'RELIVE'.
(Other definitions for relive that I've seen before include "Experience afresh" , "Experience again in the imagination" .)