26 across
Invalidates
lines
in
newspaper
after
backlash?
(5)
Invalidates lines in newspaper after backlash? (5)
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The definition is at the beginning of the clue.
How the clue works
The definition is Invalidates, meaning renders void. You've got "newspaper" as SUN, which you reverse for the "backlash" to get NUS, then pop "lines" (LL) inside it to make NU-LL-S.