Liszt lawsuit holds back piece of music (5)
I believe the answer is:
waltz
'music' is the definition.
(waltz is a kind of music)
'liszt lawsuit holds back piece' is the wordplay.
'piece' indicates the answer is hidden within the clue.
'holds back' says the letters should be written in reverse (I've seen 'held back' mean this).
'ztlaw' is hidden within 'liszt lawsuit'.
'ztlaw' in reverse letter order is 'WALTZ'.
'of' acts as a link.
(Other definitions for waltz that I've seen before include "Last dance?" , "The 123, 123 ballroom dance" , "Dance in 3/4 time" , "Three-time dance" , "Dance in three-four time" .)