Lines of WWI troops cut down on the way (6)
I believe the answer is:
'lines' is the definition.
(group of lines in a poem)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for stanza that I've seen before include "Section of poem" , "Group of poetic lines" , "piece of poetry" , "Lines of poetry forming a pattern" , "Unit of a poem" .)