A lot of excellent beer is the last thing you want? (6)
I believe the answer is:
finale
'the last thing you want?' is the definition.
I can't tell whether this definition defines the answer.
'a lot of excellent beer' is the wordplay.
'a lot of' means to remove the last letter (most of the word but not all of it).
'excellent' becomes 'fine' ('fine' can be a synonym of 'excellent').
'beer' becomes 'ale' (I've seen this before).
'fine' with its last letter taken away is 'fin'.
'fin'+'ale'='FINALE'
'is' is the link.
Can you help me to learn more?
(Other definitions for finale that I've seen before include "Closing part of an entertainment" , "Last part of something" , "In leaf (anag.)" , "Denouement" , "The concluding part of a performance" .)