Worried Rishi's first PM with Department for Sleaze? At last! (7)

I believe the answer is:

rattled

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'worried' is the definition.
(to rattle someone is to unnerve or worry them)

I don't understand the rest of the clue.

(Other definitions for rattled that I've seen before include "Worried, irritated" , "Made a series of clattering sounds" , "What some snakes did" , "Unnerved" , "made use of 8 [NOISEMAKER]" .)

I've seen this clue in The Guardian.

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