From the perspective of this UK cruciverbalist that's a terrible clue. You can't just clue anything you like and call it a cryptic definition. I would argue there isn't even a proper definition component to the clue since 'poisoned penne' isn't a 'pasta dish' in any normal usage. A fair way to clue this would be to indicate the pun and use normal composite clueing (e.g. anagrams).