Openly, and clumsily, stole sum from inn, perhaps - awful! (8)
I believe the answer is:
publicly
'openly' is the definition.
(thesaurus)
'clumsily stole sum from inn perhaps awful' is the wordplay.
I cannot really understand how this works, but
'inn' could be 'pub' (both can mean a drinking establishment) and 'pub' is located in the answer.
'perhaps' could be 'y' (I've seen this in other clues) and 'y' is present in the answer.
This explanation may well be incorrect...
'and' is the link.
Can you help me to learn more?
(Other definitions for publicly that I've seen before include "Not in a private manner" , "For all to see" , "Openly, in front of all" .)