Final point of the sentence (8)

I believe the answer is:

fullstop

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'the sentence' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'final point' is the wordplay.
'final' becomes 'fulls' (I am not sure about this - if you are sure you should believe this answer much more).
'point' becomes 'top' (top is a kind of point).
'fulls'+'top'='FULLSTOP'

'of' is the link.

Can you help me to learn more?

I've seen this clue in The Irish News.

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