What is found - not very good party for dancers (5)
I believe the answer is:
disco
'party for dancers' is the definition.
(I've seen this before)
'what is found not very good' is the wordplay.
I cannot quite see how this works, but
'is' is found in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for disco that I've seen before include "Style of music/dancing" , "Youngsters' dance venue" , "Dancehall with recorded music, in short" , "One might get down to this" , "Demonic spirit" .)