Here are the possible solutions for o'brien is replacing him clue
Answer
Clue
Relevancy
leno
Clue
O'Brien is replacing him
Fallon's replacing him
Fallon is replacing him as host in 2014
O'Brien is scheduled to succeed him
O'Brien is slated to succeed him in 2009
Definition
a thin, muslin-like fabric
jay
Clue
Jimmy is replacing him on "The Tonight Show" tomorrow
Jimmy is replacing him
Definition
a corvine bird, also JAYBIRD
neko
Clue
Rocker Case who tweeted "If a dude called me a 'cougar' I'd be more likely to kill him bare-handed and shit him out in front of his parents than fuck him"