Split internally, putsch is miscarrying (6)
I believe the answer is:
schism
'split' is the definition.
(I know that split can be written as schism)
'internally putsch is miscarrying' is the wordplay.
'internally' indicates the answer is hidden within the clue.
'SCHISM' is hidden in the letters of 'putsch is miscarrying'.
(Other definitions for schism that I've seen before include "Deep division" , "Dividing of group into opposing factions" , "Breach or division within church" , "Split, especially ecclesiastical" , "Formal split in a religion" .)