Eritrea bans impossible riddle (11)

I believe the answer is:

brainteaser

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

'riddle' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'eritrea bans impossible' is the wordplay.
'impossible' indicates anagramming the letters (impossible ordering of the letters).
'eritrea'+'bans'='eritreabans'
'eritreabans' with letters rearranged gives 'BRAINTEASER'.

Can you help me to learn more?

(Other definitions for brainteaser that I've seen before include "It might be difficult" , "Puzzling thing" , "Puzzle" , "difficult exercise" .)

I've seen this clue in The Irish Times.

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