Lines of WWI troops cut down on the way (6)

I believe the answer is:

stanza

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'lines' is the definition.
(group of lines in a poem)

I don't understand the remainder of the clue.

(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" .)

I've seen this clue in The Times.

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