Dance with prisoner, happy for the most part (5)
I believe the answer is:
conga
'dance' is the definition.
(conga is a type of dance)
'prisoner happy for the most part' is the wordplay.
'prisoner' becomes 'con' (abbreviation for 'convict').
'happy' becomes 'gay' (similar in meaning).
'for the most part' means to remove the last letter (most but not all of the letters).
'gay' with its final letter taken off is 'ga'.
'con'+'ga'='CONGA'
'with' acts as a link.
(Other definitions for conga that I've seen before include "Lined-up dance" , "Long-line dance" , "Dance performed in line" , "Cuban dance of three steps followed by a kick" , "wiggling line" .)