Gang in Caribbean island denied new papers (5)
I believe the answer is:
triad
'gang' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for triad that I've seen before include "Chinese secret society" , "Three-note chord -- Chinese criminal gang" , "trio" , "Set of three; chord" , "three making a sound?" .)