Excess froth, the thing around end of pipe (7)
I believe the answer is:
surfeit
'excess' is the definition.
('surfeit' can be a synonym of 'excess')
'froth the thing around end of pipe' is the wordplay.
'froth' becomes 'surf' (I have seen 'Froth of wave ' mean 'surf' so perhaps 'froth' could also mean 'surf'**).
'the thing' becomes 'it'.
'around' means one lot of letters goes inside another.
'end of' indicates one should take the final letters.
The last letter of 'pipe' is 'e'.
'surf'+'it'='surfit'
'surfit' enclosing 'e' is 'SURFEIT'.
(Other definitions for surfeit that I've seen before include "excessive amount" , "Overindulgence" , "Fustier (anag)" , "having had quite enough" , "Excess, glut" .)