The most common and most likely answer to this crossword clue is the 6 letter word RHOTIC
I've seen this crossword clue in The Guardian
R
H
O
T
I
C
More clues leading to the result RHOTIC
Buddy explains!
The straight part
We know that "accent" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case accent = rhotic.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does RHOTIC mean?
RHOTIC noun- A rhotic consonant or rhotic vowel (R-coloured vowel).
- (of an English accent) That allows the phoneme /ɹ/ even when not followed by a vowel, as in bar (/bɑːɹ/) and bard or barred (/bɑːɹd/); (of an English speaker) who speaks with such an accent.
- (of a phoneme) Having a sound quality associated with the letter R; having the sound of any of certain IPA symbols, including /ɹ/, /ɻ/, /ɚ/, /ɝ/ and /r/.