Which person heard laughter and commotion (3-2)

I believe the answer is:

hoo-ha

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'commotion' is the definition.
(I know that commotion can be written as hoo-ha)

'which person heard laughter' is the wordplay.
'which person' becomes 'who' (I've seen this before).
'heard' indicates a 'sounds like' (homophone) clue.
'laughter' becomes 'ha' (I can't justify this - if you can you should believe this answer much more).
'who' sounds like 'hoo'.
'hoo'+'ha'='HOO-HA'

'and' acts as a link.

Can you help me to learn more?

(Other definitions for hoo-ha that I've seen before include "Fuss (informal)" , "Song and dance" , "Noisy confusion" , "Commotion (informal)" , "Kerfuffle" .)

I've seen this clue in The Independent.

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