Decoration and high honour presented after pageantry (6)
I believe the answer is:
pompom
'decoration' is the definition.
(pompom is a kind of decoration)
'presented after pageantry' is the wordplay.
'presented' becomes 'om' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'after' says to put letters next to each other.
'pageantry' becomes 'pomp' (I've seen this in another clue).
'om' put after 'pomp' is 'POMPOM'.
'and high honour' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for pompom that I've seen before include "Top decoration" , "Cheerleader's ball of material" , "Hat ornament" , "Woolly decoration" , "Anti-aircraft weapon" .)