Mad boozer keels over unconscious (5)

I believe the answer is:

rabid

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'mad' is the definition.
(I've seen this before)

'boozer keels over unconscious' is the wordplay.
'boozer' becomes 'bar'.
'keels over' shows that the letters should be reversed in order.
'unconscious' becomes 'id' (I can't explain this - if you can you should give a lot more credence to this answer).
'bar' reversed gives 'rab'.
'rab'+'id'='RABID'

Can you help me to learn more?

(Other definitions for rabid that I've seen before include "Fanatical - hydrophobic" , "Violent; hydrophobic" , "Extreme, fanatical" , "Frenzied" , "Infected with hydrophobia" .)

I've seen this clue in The Times.

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