Crossword Genius

Group in the know about attack (3,4)

Ross

I believe the answer is:

set upon

'attack' is the definition.
(setting upon is a kind of attacking)

'group in the know' is the wordplay.
'group' becomes 'set' (both can mean a collection).
'in the know' becomes 'upon' (I've seen this in another clue).
'set'+'upon'='SET UPON'

'about' is the link.

(Other definitions for set upon that I've seen before include "Attack" , "Mug" , "Determined to do (something)" , "Attacked" .)

I've seen this clue in The Sunday Times.
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