Go with Italian lager and spicy sausage (9)
I believe the answer is:
pepperoni
'spicy sausage' is the definition.
(I've seen this before)
'go with italian lager' is the wordplay.
'go' becomes 'pep' (both can mean energy or vitality).
'with' is a charade indicator (letters next to each other).
'italian lager' becomes 'Peroni' (I've seen this in another clue).
'pep'+'peroni'='PEPPERONI'
'and' is the link.
(Other definitions for pepperoni that I've seen before include "Butterfly-attracting shrub" , "Spicy Italian sausage" , "Hard, spicy beef and pork sausage" , "Seasoned beef/pork sausage" , "spicy stuff" .)