Arranged systematically; shocked! (9)

I believe the answer is:

staggered

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This clue could be a double definition.

'arranged systematically' is the first definition.
'staggered' can be an answer for 'arranged' (staggering is a kind of arranging). I'm not sure about the 'systematically' bit.

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

Can you help me to learn more?

(Other definitions for staggered that I've seen before include "Bowled over" , "Arranged to take place at intervals" , "Did floor" , "Gobsmacked" , "Amazed" .)

I've seen this clue in The Everyman puzzle in The Observer.

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