Row after vacant tavern essentially collapsed (5,2)

'collapsed' is the definition.
('cave in' can be a synonym of 'collapse')

'row after vacant tavern essentially' is the wordplay.
'row' becomes 'din' (both can mean a loud disturbance).
'after' says to put letters next to each other.
'vacant' becomes 'ca' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'essentially' means to look at the middle letters.
The middle of 'tavern' is 've'.
'ca'+'ve'='cave'
'din' put after 'cave' is 'CAVED IN'.

Can you help me to learn more?