Crossword Genius

Irritable declaration of one in Casualty? (9)

Ross

I believe the answer is:

impatient

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

I cannot understand how the rest of the clue works.

(Other definitions for impatient that I've seen before include "Fidgety" , "Irritable" , "Unlike Job" , "restive" , "not able to wait" .)

I've seen this clue in The Times.
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