Startled criminal drops back on all fours (7)
I believe the answer is:
tetrads
'fours' is the definition.
('tetrad' can be a synonym of 'four')
I don't understand the rest of the clue.
Can you help me to learn more?
(Another definition for tetrads that I've seen is " Started to get groups of four".)
I've seen this clue in The Independent.
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