Crossword Genius

How a fellow's amusement may be killing? (12)

Ross

I believe the answer is:

manslaughter

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

'be killing?' is the definition.
(I have seen 'Unlawful killing ' mean 'manslaughter' so perhaps 'killing' could also mean 'manslaughter')

'how a fellow's amusement' is the wordplay.
I cannot quite see how this works, but
'a' could be 'an' and 'an' is located in the answer.
'amusement' could be 'laughter' (I've seen this before) and 'laughter' is present in the answer.
The remaining letters 'ms' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'may' is the link.

Can you help me to learn more?

(Other definitions for manslaughter that I've seen before include "Unlawful killing" , "charge?" , "Killing without malice" , "Homicide without malice aforethought" , "Crime of killing, short of murder" .)

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