Crossword Genius

As taken by a suicide? (5,8)

Ross

I believe the answer is:

fatal decision

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

'suicide?' is the definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?

'as taken by a' is the wordplay.
I cannot really understand how this works, but
'by' could be 'at' and 'at' is present in the answer.
'a' is within the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Globe and Mail.
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