In the Senate, HRC tried to have Iran's National Guard declared a "terrorist group," placing the country within the scope of the "Global War on Terror." It's really not that inconceivable that she'd work with the GOP to start the conflict with Iran that they and Netanyahu are dreaming about.
She also supports (and sent Jake Sullivan to lay the groundwork for in 2012) the nuclear deal signed with Iran. Even many of those opposed to the deal wouldn't start a war with Iran. So it's even more absurd to think that someone who supports it would.
I mean, even the Bush administration, certainly no nest of doves, held back on attacking Iran in 2006-2008.
She's running for President and trying to win the support of the Obama coalition, so from here on out I'll be separating her rhetoric from her actions. All a Clinton admin would have to do with the framework agreement in place would be to distort intelligence to say Iran was violating the terms, which isn't outside the realm of possibility given her going along with W's lies and her and her allies in the State Dept lying about Bashar Assad.