Party led by adulterous leader? For shame! (5)
I believe the answer is:
abash
'shame' is the definition.
(I've seen this before)
'party led by adulterous leader?' is the wordplay.
'party' becomes 'bash' (bash is a kind of party**).
'led by' says to put letters next to each other.
'leader?' indicates taking the first letters (I've seen 'leader' mean this).
The first letter of 'adulterous' is 'a'.
'bash' after 'a' is 'ABASH'.
'for' is the link.
(Other definitions for abash that I've seen before include "Cause to feel 4" , "Discomfit" , "Cause someone to feel embarrassed" , "put one to shame" , "Cause embarrassment" .)