Character flaw seen in party politics (4)
I believe the answer is:
typo
'character flaw' is the definition.
(I've seen this before)
'in party politics' is the wordplay.
'in' indicates the answer is hidden within the clue.
'TYPO' is hidden in the letters of 'party politics'.
'seen' is the link.
(Other definitions for typo that I've seen before include "Printer's mistake" , "Literal error in printed matter, in short" , "Misprint" , "What's not right" , "Thanks; good health!" .)