Approve of gin? Rubbish! (8)
I believe the answer is:
claptrap
'rubbish' is the definition.
(I've seen this before)
'approve of gin?' is the wordplay.
'approve of' becomes 'clap' (I am not sure about this - if you are sure you should believe this answer much more).
'gin?' becomes 'trap' (ginning is a kind of trapping).
'clap'+'trap'='CLAPTRAP'
Can you help me to learn more?
(Other definitions for claptrap that I've seen before include "Rhyme" , "Meaningless nonsense" , "Utter rubbish" , "moonshine" , "Stuff and nonsense" .)