Piece of poetry from somewhere in Switzerland, unfinished? (5)
I believe the answer is:
canto
'piece of poetry' is the definition.
(I've seen this before)
'somewhere in switzerland unfinished?' is the wordplay.
'somewhere in switzerland' becomes 'canton' (Swiss administrative subdivision).
'unfinished?' means to remove the last letter (I've seen 'unfinished' mean this).
'canton' with its final letter taken away is 'CANTO'.
'from' acts as a link.
(Other definitions for canto that I've seen before include "part of long poem" , "piece of poetry" , "Each of sections into which long poem is divided" , "Portion of poem" , "melodic piece of music" .)