Goad insiders who are disgracefully shambolic (12)

I believe the answer is:

disorganised

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

'are disgracefully shambolic' is the definition.
I can't tell whether this definition defines the answer.

'goad insiders' is the wordplay.
'goad insiders' can be anagrammed to 'DISORGANISED'.
But, I am not sure how this is indicated.

'who' acts as a link.

Can you help me to learn more?

(Other definitions for disorganised that I've seen before include "Not properly planned" , "Chaotic" , "messed up" .)

I've seen this clue in The Irish Times.

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