Tramp drunkenly around the Waterloo terminus bar (7)
I believe the answer is:
taproom
'bar' is the definition.
(I know that bar can be written as taproom)
'tramp drunkenly around the waterloo terminus' is the wordplay.
'drunkenly' indicates anagramming the letters.
'around' indicates putting letters inside.
'the waterloo terminus' becomes 'oo' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'tramp' is an anagram of 'taprm'.
'taprm' placed around 'oo' is 'TAPROOM'.
Can you help me to learn more?
(Other definitions for taproom that I've seen before include "Public bar" , "Source of beer" , "liquor shop" , "Type of bar" , "part of pub" .)