In the end, salsa and tango are just a song and dance (3)
I believe the answer is:
ado
'a song and dance' is the definition.
(both can mean a commotion or fuss)
'in the end salsa and tango' is the wordplay.
'in the end' suggests the final letters.
The final letters of 'salsa and tango' are 'ADO'.
'are just' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for ado that I've seen before include "Nothing caused much around 1598" , "Flap" , "Fuss, difficulty" , "Fuss, bother" , "excitement" .)