Sharp way of speaking used while demonstrating how letter might be modified (5,6)

I believe the answer is:

acute accent

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'speaking used while demonstrating how letter might be modified' is the definition.
I can't tell whether this defines the answer.

'sharp way' is the wordplay.
'sharp' becomes 'acute' (synonyms).
'way' becomes 'accent' (I have seen 'Way of speaking ' mean 'accent' so perhaps 'way' could also mean 'accent').
'acute'+'accent'='ACUTE ACCENT'

'of' acts as a link.

Can you help me to learn more?

(Another definition for acute accent that I've seen is " This vowel adjustment".)

I've seen this clue in The Irish Times.

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