More generous with beer around end of bar (6)
I believe the answer is:
larger
'more generous' is the definition.
('large' can be similar in meaning to 'generous')
'beer around end of bar' is the wordplay.
'beer' becomes 'lager' (lager is a kind of beer).
'around' means one lot of letters goes inside another.
'end of bar' becomes 'r' (I've seen this in other clues).
'lager' placed around 'r' is 'LARGER'.
'with' acts as a link.
(Other definitions for larger that I've seen before include "Bigger, greater" , "More bulky" , "Comparatively bigger" , "Greater in size" , "Ebullient person may be describes as ?? than life" .)