Song and dance with endless trouble (6)
I believe the answer is:
ballad
'song' is the definition.
(ballad is a kind of song)
'dance with endless trouble' is the wordplay.
'dance' becomes 'ball' (ball is a kind of dance**).
'with' means one lot of letters go next to another.
'endless' means to remove the last letter.
'trouble' becomes 'ado' (I've seen this before).
'ado' with its final letter taken away is 'ad'.
'ball'+'ad'='BALLAD'
'and' acts as a link.
(Other definitions for ballad that I've seen before include "Slow romantic song" , "Song type" , "delivered by singer" , "romance" , "Slow sentimental song" .)