Live in this sincere period? (8)

I believe the answer is:

realtime

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'live in' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'sincere period?' is the wordplay.
'sincere' becomes 'real' (similar in meaning).
'period?' becomes 'time' (period of time).
'real'+'time'='REALTIME'

'this' is the link.

Can you help me to learn more?

I've seen this clue in The Irish Times.

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