Dance enthusiast and karate expert leave (8)
I believe the answer is:
fandango
'dance' is the definition.
(type of dance)
'enthusiast and karate expert leave' is the wordplay.
'enthusiast' becomes 'fan' (fan is a kind of enthusiast).
'and' is a charade indicator (letters next to each other).
'karate expert' becomes 'dan' (person who has been awarded a dan in karate).
'leave' becomes 'go' (to go is to depart or leave).
'fan'+'dan'+'go'='FANDANGO'
(Other definitions for fandango that I've seen before include "Lively Spanish dance" , "Old Spanish dance, with castanets" , "Dance performed with castanets" , "Spanish 2 Down" , "Old Spanish dance in triple time" .)