Collapses about blood vessels (4-3)
I believe the answer is:
cave-ins
'collapses' is the definition.
(cave in is a kind of collapse)
'about blood vessels' is the wordplay.
'about' becomes 'ca' (abbreviation for 'circa').
'blood vessels' becomes 'veins' (vein is a kind of blood vessel).
'ca'+'veins'='CAVE-INS'
I've seen this clue in the Sydney Morning Herald.
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