Crossword Genius

Back with a little less than a dollar from abroad (4)

Ross

I believe the answer is:

cuba

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

'little less than a dollar from abroad' is the definition.
I can't judge whether this defines the answer.

'back with a' is the wordplay.
'back' becomes 'cub' (I can't justify this - if you can you should give a lot more credence to this answer).
'with' says to put letters next to each other.
'cub'+'a'='CUBA'

Can you help me to learn more?

(Other definitions for cuba that I've seen before include "Caribbean nation" , "Island nation" , "Guantanamo Bay island" , "Island N. of Jamaica" , "Caribbean island republic" .)

I've seen this clue in the Evening Standard.
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