No end of elan following Russian ruler’s Hungarian dance (7)
I believe the answer is:
czardas
'hungarian dance' is the definition.
'czardas' can be an answer for 'dance' (I've seen this before). I'm not certain of the 'hungarian' bit.
'no end of elan following russian ruler's' is the wordplay.
'no end of' means to remove the last letter.
'elan' becomes 'dash' (both can mean energy).
'following' means one lot of letters go next to another.
'russian ruler' becomes 'czar' (I've seen this in another clue).
'dash' with its final letter removed is 'das'.
'das' after 'czar' is 'CZARDAS'.
Can you help me to learn more?
(Another definition for czardas that I've seen is " dance".)