Crossword Genius

Spot fine, then jail for West Indian (8)

Ross

I believe the answer is:

jamaican

I'm a little stuck... Click here to teach me more about this clue!

'for west indian' is the definition.
(Jamaican is an example)

'spot fine then jail' is the wordplay.
I cannot really see how this works, but
'spot' could be 'jam' (I've seen this in another clue) and 'jam' is located in the answer.
'fine' could be 'ai' (resembles A1, informal term for top quality) and 'ai' is located in the answer.
'jail' could be 'can' (the can is American slang for prison) and 'can' is present in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for jamaican that I've seen before include "Island's" , "Eg, native of Kingston" , "From Kingston, perhaps" , "Caribbean island resident" , "Bob Marley, for instance" .)

I've seen this clue in The Independent.
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