A more reasonable, faultless service to the West Indies (5)
I believe the answer is:
wiser
'a more reasonable faultless' is the definition.
I can't judge whether this defines the answer.
'service to the west indies' is the wordplay.
'service' becomes 'ser' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'the west indies' becomes 'wi'.
'ser' after 'wi' is 'WISER'.
Can you help me to learn more?
(Other definitions for wiser that I've seen before include "showing more understanding?" , "More prudent" , "more enlightened" , "More sensible" , "Less foolish" .)