Song for dance these days (6)
I believe the answer is:
ballad
'song' is the definition.
(ballad is a kind of song)
'dance these days' is the wordplay.
'dance' becomes 'ball' (ball is a kind of dance).
'these days' becomes 'AD' (as in Anno Domini, after Christ).
'ball'+'ad'='BALLAD'
'for' is the link.
(Other definitions for ballad that I've seen before include "A simple or old song" , "Lay, narrative song" , "Song type" , "delivered by singer" , "Slow sentimental song" .)