To some extent maybe a charming seaside place (5)
I believe the answer is:
beach
'seaside place' is the definition.
'to some extent maybe a charming' is the wordplay.
'to some extent' indicates the answer is hidden within the clue (I've seen 'extent of' mean this (I've seen this in other clues)).
'BEACH' is hidden within 'maybe a charming'.
(Other definitions for beach that I've seen before include "Sands" , "Sandy sea shore" , "Shore between high and low water marks" , "Sloping part of shore" , "Stretch of coastline" .)