Right, so birthplaces of 6 and 28 is your definition — remember 6 down is REDRUM and 28 across is SHERGAR, and both those famous racehorses were foaled at stud farms, hence the phrase. For the wordplay, take "Dr Faust" and give it a shake since it's "confused" (that's your anagram indicator), then bolt on MS for manuscript — all those letters, D,R,F,A,U,S,T,M,S, tumble together to spell out the answer.