Manage to obtain case of bubbly (3,2)
I believe the answer is:
get by
'manage' is the definition.
('get by' can be a synonym of 'manage')
'obtain case of bubbly' is the wordplay.
'obtain' becomes 'get' ('get' can be a synonym of 'obtain').
'case of' means to remove the middle letters (outsides of).
'bubbly' with its centre removed is 'by'.
'get'+'by'='GET BY'
'to' acts as a link.
(Other definitions for get by that I've seen before include "Deal with" , "Manage with difficulty" , "Make do" , "Manage to cope" , "Manage satisfactorily" .)