Laughter in company's causing disorder (5)

I believe the answer is:

chaos

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'disorder' is the definition.
(I know that disorder can be written as chaos)

'laughter in company's' is the wordplay.
'laughter' becomes 'ha' (I can't justify this - if you can you should believe this answer much more).
'in' indicates putting letters inside.
'company's' becomes 'co's' (abbreviation).
'ha' going inside 'cos' is 'CHAOS'.

'causing' is the link.

Can you help me to learn more?

(Other definitions for chaos that I've seen before include "[MAYHEM]" , "Absence of order" , "Pandemonium" , "upheaval" , "confused state" .)

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

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