Fish and chips at last with beer? Nonsense (10)
I believe the answer is:
codswallop
'nonsense' is the definition.
(I've seen this before)
'fish and chips at last with beer?' is the wordplay.
'fish' becomes 'cod' (type of fish).
'and' says to put letters next to each other.
'at last' says to take the final letters.
'with' means one lot of letters go next to another.
'beer?' becomes 'wallop' (I've seen this before).
The last letter of 'chips' is 's'.
'cod'+'s'+'wallop'='CODSWALLOP'
(Other definitions for codswallop that I've seen before include "Rubbish!" , "waffle?" , "Baloney" , "Hogwash" , "moonshine" .)