I mete out sentence at just the right moment (5,4)

I believe the answer is:

ideal time

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'just the right moment' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'i mete out sentence' is the wordplay.
'mete out' becomes 'deal' (dealing is a kind of meting out).
'sentence' becomes 'time' (a prison sentence).
'i'+'deal'+'time'='IDEAL TIME'

'at' is the link.

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I've seen this clue in the Evening Standard.

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