It may be bought in a pub or thereabouts (6)
I believe the answer is:
around
'thereabouts' is the definition.
(thesaurus)
'it may be bought in a pub' is the wordplay.
I cannot quite see how this works, but
'a' is within the answer.
The remaining letters 'round' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'or' acts as a link.
Can you help me to learn more?
(Other definitions for around that I've seen before include "More or less" , "Present; approximately" , "In the area of" , "Close to" , "Here and there, sounds circular" .)