Crossword Genius

To retain order, attack vigorously (4,4)

Ross

I believe the answer is:

tear into

'attack vigorously' is the definition.
(I've seen this in another clue)

'to retain order' is the wordplay.
'order' indicates an anagram.
'to'+'retain'='toretain'
'toretain' is an anagram of 'TEAR INTO'.

(Other definitions for tear into that I've seen before include "Attack verbally" , "Scold furiously" , "handbag" .)

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