When no-one is inconclusive (4)

I believe the answer is:

noon

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'when no-one is inconclusive' is the definition.
I can't tell whether this defines the answer.

'no-one is inconclusive' is the wordplay.
'is inconclusive' means to remove the last letter.
'one' with its last letter taken off is 'on'.
'no'+'on'='NOON'

Can you help me to learn more?

(Other definitions for noon that I've seen before include "The middle of the day" , "[LUNCHTIME] ?" , "Twelve o'clock, midday" , "Twelve during daylight" , "when only mad dogs go out?" .)

I've seen this clue in the Evening Standard.

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