Maybe those who disagree just can't see it (5)

I believe the answer is:

sense

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'it' is the definition.
The definition suggests a singular noun which matches the answer.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for sense that I've seen before include "Feel, perceive" , "Feeling - reason" , "Be vaguely aware of" , "eg Taste, smell" , "A particular meaning" .)

I've seen this clue in the Evening Standard.

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