Get on aboard long grand procession (7)

I believe the answer is:

pageant

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'grand procession' is the definition.
'pageant' can be an answer for 'procession' (I've seen this before). I'm unsure of the 'grand' bit.

'get on aboard long' is the wordplay.
'get on' becomes 'age' (synonyms).
'aboard' indicates putting letters inside.
'long' becomes 'pant' (I've seen this in other clues).
'age' going within 'pant' is 'PAGEANT'.

Can you help me to learn more?

(Other definitions for pageant that I've seen before include "Neat gap for colourful spectacle" , "Dramatic performance" , "Splendid procession, parade" , "Show" , "elaborate display" .)

I've seen this clue in The Telegraph.

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