Crossword Genius

Fatberg sat about causing alarm (11)

Ross

I believe the answer is:

flabbergast

'alarm' is the definition.
(flabbergasted means alarmed or shocked)

'fatberg sat about' is the wordplay.
'fatberg' becomes 'flabberg' (I can't justify this - if you can you should believe this answer much more).
'about' indicates anagramming the letters.
'sat' with letters rearranged gives 'ast'.
'flabberg'+'ast'='FLABBERGAST'

'causing' acts as a link.

(Other definitions for flabbergast that I've seen before include "floor" , "stunning" , "Surprise greatly" , "Strike dumb" , "Astonish" .)

I've seen this clue in The Guardian.
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