Piece of poetry by Antipodean soldier unfinished after street evacuated (6)
I believe the answer is:
stanza
'piece of poetry' is the definition.
(group of lines in a poem)
'antipodean soldier unfinished after street evacuated' is the wordplay.
'antipodean soldier' becomes 'Anzac' (Australian and New Zealand Army Corps soldier).
'unfinished' means to remove the last letter.
'after' is a charade indicator (letters next to each other).
'evacuated' suggests removing the centre.
'street' with its middle taken out is 'st'.
'anzac' with its last letter taken away is 'anza'.
'anza' after 'st' is 'STANZA'.
'by' acts as a link.
(Other definitions for stanza that I've seen before include "Group of poetic lines" , "piece by poet" , "Section of poem" , "A verse of poetry" , "piece of poetry" .)