Over-organised and pompous (9)

I believe the answer is:

grandiose

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

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

'over-organised' is the wordplay.
'organised' anagrams to 'GRANDIOSE'.
But, I'm not clear how this is indicated.

'and' acts as a link.

Can you help me to learn more?

(Other definitions for grandiose that I've seen before include "Planned on a magnificent scale" , "Pretentiously magnificent" , "affected" , "Ambitious" , "Ridiculously impressive or imposing" .)

I've seen this clue in the Sydney Morning Herald.

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