A noted lack of agreement (7)

I believe the answer is:

discord

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'lack of agreement' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for discord that I've seen before include "contention" , "Dissension" , "Strife, lack of harmony" , "Friction" , "Opposition" .)

I've seen this clue in The Irish Independent.

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