Crossword Genius

When a politician takes office, there's ceremony (4)

Ross

I believe the answer is:

pomp

I'm a little stuck... Click here to teach me more about this clue!

'ceremony' is the definition.
(I've seen this before)

'when a politician takes office' is the wordplay.
I cannot really understand how this works, but
'politician' could be 'mp' (Member of Parliament) and 'mp' is found within the answer.
The remaining letters 'po' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'there's' is the link.

Can you help me to learn more?

(Other definitions for pomp that I've seen before include "Ostentation - vanity" , "Boastful display" , "Ceremoniousness" , "Splendid ceremonial" , "Grandiosity" .)

I've seen this clue in the Evening Standard.
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