Pub-o’clock, getting round in very quickly (2,2,4)
I believe the answer is:
in no time
'very quickly' is the definition.
(I've seen this before)
'pub-o'clock getting round' is the wordplay.
'pub' becomes 'inn' (an inn is a type of pub).
'o'clock' becomes 'time' (I can't justify this - if you can you should believe this answer much more).
'getting' is a charade indicator (letters next to each other).
'round' becomes 'o' (o is a circular letter).
'time' put after 'o' is 'otime'.
'inn'+'otime'='IN NO TIME'
'in' is the link.
Can you help me to learn more?
(Other definitions for in no time that I've seen before include "Very rapidly - but sounds impossible?" , "Very quickly" , "Very rapidly, hardly measurable" , "Immediately" , "Swiftly" .)