Crossword Genius

Spectator on toilet when kerfuffle starts (8)

Ross

I believe the answer is:

onlooker

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

'spectator' is the definition.
(I know that onlooker is a type of spectator)

'on toilet when kerfuffle starts' is the wordplay.
'on' is a charade indicator (letters next to each other).
'toilet' becomes 'loo' (loo can informally mean a toilet).
'when' becomes 'on' (I've seen this in other clues).
'kerfuffle starts' becomes 'ker' (I can't justify this - if you can you should believe this answer much more).
'loo' after 'on' is 'onloo'.
'onloo'+'ker'='ONLOOKER'

Can you help me to learn more?

(Other definitions for onlooker that I've seen before include "He stands and watches" , "Non-participant" , "Bystander" , "Spectator" , "Person watching" .)

I've seen this clue in the Sydney Morning Herald.
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