After a drink Jack goes back to dance (5)
I believe the answer is:
rumba
'dance' is the definition.
(rumba is a kind of dance)
'after a drink jack goes back' is the wordplay.
'after' is a charade indicator (letters next to each other).
'a drink' becomes 'rum' (rum is a kind of drink**).
'jack' becomes 'ab'.
'goes back' is a reversal indicator.
'ab' written backwards gives 'ba'.
'rum' next to 'ba' is 'RUMBA'.
'to' acts as a link.
(Other definitions for rumba that I've seen before include "Cuban folk-dance" , "Ballroom dance of Cuban origin" , "Rhythmic dance of Cuban origin" , "Dance originating in Cuba" , "Burma (anag)" .)