It's good after study to have a dance (5)
I believe the answer is:
conga
'dance' is the definition.
(I've seen this before)
'it's good after study to have a' is the wordplay.
'it's good' becomes 'g' (abbreviation).
'after' says to put letters next to each other.
'study' becomes 'con' (I've seen this before).
'to have' says to put letters next to each other.
'g' after 'con' is 'cong'.
'cong'+'a'='CONGA'
(Other definitions for conga that I've seen before include "Single-file dance" , "Party dance" , "Long-line dance" , "Latin American dance performed in single file" , "What gets line moving rhythmically" .)