Contribute nothing to replace current composer (6)
I believe the answer is:
chopin
'composer' is the definition.
(Frederic Chopin)
'contribute nothing to replace current' is the wordplay.
I cannot quite see how this works, but
'nothing' could be 'o' (O resembles 0) and 'o' is located in the answer.
'current' could be 'in' ('in' can mean current or trendy) and 'in' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for chopin that I've seen before include "Composer of "Tristesse"" , "popular composer" , "Romantic figure" , "Frederic -, nineteenth century Polish pianist and composer" , "Double centenarian" .)