Crossword Genius

Collapse caused by calcium meeting blood vessel? (4,2)

Ross

I believe the answer is:

cave in

'collapse' is the definition.
(cave in is a kind of collapse)

'calcium meeting blood vessel?' is the wordplay.
'calcium' becomes 'ca' (Ca is the chemical symbol for calcium).
'meeting' says to put letters next to each other.
'blood vessel?' becomes 'vein' (vein is a kind of blood vessel).
'ca'+'vein'='CAVE-IN'

'caused by' is the link.

(Other definitions for cave in that I've seen before include "Collapse of, eg, tunnel" , "Subside, collapse" , "Lose willpower" , "Give way" , "Yield to outside pressure" .)

I've seen this clue in The Telegraph.
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