Shameful signs coming, sir? Lousy when disclosed (11)

I believe the answer is:

ignominious

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'shameful' is the definition.
(I know that shameful can be written as ignominious)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for ignominious that I've seen before include "Deserving public shame" , "Shameful, disgraceful" , "Deserving disgrace or shame" , "Humiliating" , "Abject" .)

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

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