Put up with something holding up the music (5)
I believe the answer is:
stand
'put' is the definition.
(standing is a kind of putting)
'up with something holding up the music' is the wordplay.
'up with' says the letters should be written backwards (move letters in down clue up).
'something' becomes 'nats' (I can't explain this - if you can you should give a lot more credence to this answer).
'holding up' is a charade indicator (letters next to each other) (in a down clue, some letters go below others).
'the music' becomes 'd'.
'nats' backwards is 'stan'.
'stan'+'d'='STAND'
Can you help me to learn more?
(Other definitions for stand that I've seen before include "Remain unaltered, tolerate" , "Be likely to rise" , "Rise; bear" , "Assume an upright position" , "Platform; attitude" .)