Record start of tweet by a politician on X (9)

I believe the answer is:

timestamp

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'record start' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'tweet by a politician on x' is the wordplay.
'tweet by' becomes 'ta' (I can't explain this - if you can you should give a lot more credence to this answer).
'a politician' becomes 'MP' (Member of Parliament).
'on' is a charade indicator (letters next to each other).
'x' becomes 'times' (I've seen this before).
'ta'+'mp'='tamp'
'tamp' after 'times' is 'TIMESTAMP'.

'of' is the link.

Can you help me to learn more?

I've seen this clue in The Times.

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