Skilful person given post covering Republican rally (13)

I believe the answer is:

demonstration

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

'rally' is the definition.
(thesaurus)

'skilful person given post covering republican' is the wordplay.
'skilful person' becomes 'demon' (I've seen this before).
'given post' becomes 'station' (both can mean a job or position. I am not sure about the 'given' bit.).
'covering' means one lot of letters goes inside another.
'republican' becomes 'R' (abbreviation in US politics).
'station' placed around 'r' is 'stration'.
'demon'+'stration'='DEMONSTRATION'

Can you help me to learn more?

(Other definitions for demonstration that I've seen before include "Protest meeting" , "Public rally as protest" , "Protest march" , "Exhibition, protest" , "It's to voice protest" .)

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.