A little bit alarmingly disturbed (10)

I believe the answer is:

marginally

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'a little bit alarmingly disturbed' is the definition.
I can't judge whether this definition defines the answer.

'alarmingly disturbed' is the wordplay.
'disturbed' indicates anagramming the letters (the order of letters is disturbed).
'alarmingly' with letters rearranged gives 'MARGINALLY'.

Can you help me to learn more?

(Other definitions for marginally that I've seen before include "in small measure" , "Barely" .)

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

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