Large financial gains from murders? (8)

I believe the answer is:

killings

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

'murders?' is the definition.
(murder is a kind of killing)

'large financial gains from' is the wordplay.
I cannot really see how this works, but
'large' could be 'l' (eg in clothes sizes) and 'l' is found in the answer.
'from' could be 'in' (I've seen this in other clues) and 'in' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for killings that I've seen is " Crimes".)

I've seen this clue in The Irish Times.

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