Tour of inns maybe with jazz, across Australia and much of Europe (5-2)
I believe the answer is:
booze-up
'tour of inns maybe' is the definition.
(inns serve alcohol)
'jazz across australia and much of europe' is the wordplay.
'jazz' becomes 'bop' (bop is a kind of jazz).
'across' indicates putting letters inside.
'australia' becomes 'oz' (informal name for Australia).
'and' means one lot of letters go next to another.
'much of europe' becomes 'EU' (European Union).
'oz'+'eu'='ozeu'
'bop' enclosing 'ozeu' is 'BOOZE-UP'.
'with' acts as a link.
(Other definitions for booze-up that I've seen before include "Bout of serious drinking" , "Drinking spree" , "Heavy drinking session" .)