Sentence:  Piecing together Corbynomics is difficult, not least because it has evolved during Mr Corbyn's time in charge of Labour. The gulf between the Labour leadership's past positions and the milder proposals in the manifesto means that enormous <WSD>uncertainty</WSD> hangs over what a Corbyn-led government would do in office. 
Meaning of the word marked with <WSD> tags:  Doubt; the condition of being uncertain or without conviction.