Hi Ripper,
It's Mickelson(with a K),there are 2 other golfers,which make up one group of 3.
You need another golfer to make up the second part of the charade.
As stymied said earlier,if you find keithsolvers post,there is a pretty good hint for the first part of the charade.
It is a 15 letter word you are looking for.I don't want to mislead anyone with the enumeration given for the 4 parts of the charade.
ONION and BANANA are part of the same group,STEAK is in a different group.