Infamy? No politician accepts that is ultimately pleasant (9)
I believe the answer is:
notoriety
'infamy?' is the definition.
(notoriety is a kind of infamy)
'no politician accepts that is ultimately pleasant' is the wordplay.
'politician' becomes 'tory' (term for a Conservative Party politician).
'accepts' indicates putting letters inside.
'that is' becomes 'ie' (abbreviation for id est, 'that is' in Latin).
'ultimately' indicates one should take the final letters.
The final letter of 'pleasant' is 't'.
'ie'+'t'='iet'
'tory' enclosing 'iet' is 'toriety'.
'no'+'toriety'='NOTORIETY'
(Other definitions for notoriety that I've seen before include "Bad publicity" , "Dishonour" , "Bad reputation" , "Fame from bad deeds" , "State of being infamous" .)