Gain access to system in blog interface (3,2)

I believe the answer is:

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'gain access to system' is the definition.
I can't tell whether this definition defines the answer.

'in blog interface' is the wordplay.
'in' says the answer is hidden in the clue.
'LOG IN' can be found hidden inside 'blog interface'.

Can you help me to learn more?

I've seen this clue in The Guardian.

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