Crossword Genius

Every so often, Cuban upset American broadcaster (3)

Ross

I believe the answer is:

nbc

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'american broadcaster' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'every so often cuban upset' is the wordplay.
'every so often' indicates alternate letters.
'upset' says the letters should be written in reverse.
The alternating letters of 'cuban' are 'cbn'.
'cbn' back-to-front is 'NBC'.

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I've seen this clue in The Irish Times.
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