Crowd supported Egypt's leader in rally (8)

I believe the answer is:

jamboree

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

'leader in rally' is the definition.
'jamboree' can be an answer for 'rally' (jamboree can mean a gathering or rally). I'm not certain of the 'leader in' bit.

'crowd supported egypt's' is the wordplay.
'crowd' becomes 'jam' (jam is a kind of crowd).
'supported' becomes 'bore' (I've seen this in another clue).
'egypt's' becomes 'e' (this could be a standard abbreviation which I don't know about).
'jam'+'bore'+'e'='JAMBOREE'

Can you help me to learn more?

(Other definitions for jamboree that I've seen before include "Lively rally" , "Spree" , "where lad of 14 [BOY SCOUT] meets more troops?" , "Scout gathering; big party" , "Lavish celebration" .)

I've seen this clue in The Telegraph.

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