Crossword Genius

Six municipalities including Northern Ireland's surrounding areas (10)

Ross

I believe the answer is:

vicinities

'surrounding areas' is the definition.
(the vicinity of something is its surrounding area)

'six municipalities including northern ireland's' is the wordplay.
'six' becomes 'VI' (Roman numerals).
'municipalities' becomes 'cities' (city is a kind of municipality).
'including' is an insertion indicator.
'northern ireland' becomes 'NI' (abbreviation).
'cities' going around 'ni' is 'cinities'.
'vi'+'cinities'='VICINITIES'

I've seen this clue in The Telegraph.
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