Some failure, so likely to get turned over? (5)
I believe the answer is:
loser
'some failure' is the definition.
(someone who has failed)
'likely to get turned over?' is the wordplay.
'likely to' becomes 'los' (I can't explain this - if you can you should give a lot more credence to this answer).
'get' is a charade indicator (letters next to each other).
'turned' says the letters should be written backwards.
'over?' becomes 're'.
're' reversed gives 'er'.
'los'+'er'='LOSER'
'so' acts as a link.
(Other definitions for loser that I've seen before include "Someone who fails consistently" , "Defeated person" , "Person who's a failure" , "Washout" , "Winner's opponent" .)