Lines roughly measured? (8)

I believe the answer is:

doggerel

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'lines' is the definition.
(lines of poor quality poetry)

I cannot understand how the rest of the clue works.

(Other definitions for doggerel that I've seen before include "questionable verse" , "William McGonagall's kind of poetry?" , "Terrible poetry" , "Rubbishy verse" , "lines of inferior quality" .)

I've seen this clue in The Globe and Mail.

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