West Indian capital — or Vigo, possibly? (4,2,5)
I believe the answer is:
port of spain
'west indian capital' is the definition.
(capital of Trinidad and Tobago)
'or vigo possibly?' is the wordplay.
I cannot quite understand how this works, but
'or' is present in the answer.
'vigo' could be 'i' (where the crossword setter is 'Vigo') and 'i' is found in the answer.
This explanation may well be incorrect...
(Other definitions for port of spain that I've seen before include "description of Barcelona" , "capital city" , "Caribbean city" , "Bilbao, for example" .)