Crossword Genius

It doesn’t agree with the number on a tin opener (3)

Ross

I believe the answer is:

not

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'it doesn't agree' is the definition.
The definition suggests a singular noun but the answer is not.

'the number on a tin opener' is the wordplay.
'the number' becomes 'no' (abbreviation for 'number'**).
'on' says to put letters next to each other.
'opener' indicates taking the first letters.
The first letter of 'tin' is 't'.
'no'+'t'='NOT'

'with' is the link.

Can you help me to learn more?

(Other definitions for not that I've seen before include "logically, operation needed" , "A negative word" , "It negates a word" , "Word of negation" , "Type of logic gate" .)

I've seen this clue in the Evening Standard.
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