Mark has an appealing dialect (5,6)
I believe the answer is:
acute accent
'mark' is the definition.
(acute accent is a kind of mark)
'an appealing dialect' is the wordplay.
'an' becomes 'a'.
'appealing' becomes 'cute' (I've seen this before).
'dialect' becomes 'accent' (synonyms).
'a'+'cute'+'accent'='ACUTE ACCENT'
'has' is the link.
(Another definition for acute accent that I've seen is " This vowel adjustment".)
I've seen this clue in The Mirror.
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