Sonnet section (6)
I believe the answer is:
stanza
'sonnet section' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for stanza that I've seen before include "Group of lines in a poem, play, etc" , "Group of poetic lines" , "Lines of poetry forming a pattern" , "Fixed number of lines of verse" , "Poetic verse" .)