Poetic patterns of line-endings (6)
I believe the answer is:
rhymes
'poetic patterns of line-endings' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for rhymes that I've seen before include "Pieces of verse" , "Terminal sounds are the same in these" , "Pieces of poetry" , "Nursery . . . . . . are jingles for children" , "Nursery . . . . . . are simple ditties for children" .)