Put on or perform a Chopin finale (3)
I believe the answer is:
don
'put on' is the definition.
(as in donning or putting on an item of clothing)
'perform a chopin finale' is the wordplay.
'perform' becomes 'do' (both can mean complete an action).
'finale' suggests the final letters.
The last letter of 'chopin' is 'n'.
'do'+'n'='DON'
'or' acts as a link.
(Other definitions for don that I've seen before include "Spanish male title" , "Member of university" , "Spanish nobleman" , "European river" , "Get into" .)