Northern Ireland director among a group of three in Caribbean location (8)
I believe the answer is:
trinidad
'caribbean location' is the definition.
(Caribbean island)
'northern ireland director among a group of three' is the wordplay.
'northern ireland' becomes 'NI' (abbreviation).
'director' becomes 'd'.
'among' indicates putting letters inside.
'a group of three' becomes 'triad' (group of three things).
'ni'+'d'='nid'
'nid' put into 'triad' is 'TRINIDAD'.
'in' acts as a link.
(Other definitions for trinidad that I've seen before include "Port of Spain island" , "... [WI ISLAND]" , "Caribbean island" , "English-speaking island off Venezuela" , "West Indies island" .)