Help! A Tory endlessly provides embarrassment (8)
I believe the answer is:
plethora
'embarrassment' is the definition.
('plethora' can be a synonym of 'embarrassment')
'help a tory endlessly provides' is the wordplay.
'endlessly' means to remove the last letter.
'provides' indicates anagramming the letters.
'help'+'a'+'tory'='helpatory'
'helpatory' with its final letter taken off is 'helpator'.
'helpator' with letters rearranged gives 'PLETHORA'.
(Other definitions for plethora that I've seen before include "Cornucopia -- superfluity" , "Excess, glut" , "Over-fullness, excess" , "Abundant supply" , "Unnecessarily large quantity" .)