WHY IS CORBYN SO CAGEY ABOUT ANOTHER REFERENDUM?

Does Corbyn realise that very many of his labour voters want to get out of the EU?  Of course he does.  They would prefer NO DEAL to one that kept us tied to the EU.  There are many, probably most of all voters at the time, who understood that leaving the EU meant there would be no need for a DEAL.  Dealing just didn't feature.