Right through the sentence? (3,2,3,4)

I believe the answer is:

all of the time

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

'through the sentence?' is the wordplay.
'through' becomes 'allof' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'sentence?' becomes 'time' (a prison sentence).
'allof'+'the'+'time'='ALL OF THE TIME'

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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