If spin means anything it means trying to put the most favourable interpretation on a person, object or action, typically on behalf on a client. What it should never mean is telling a downright lie, since lies are always found out.
An example: an estate agent abuses a client's trust by stealing from an apartment he is supposed to be selling to fund a drug habit. The owner of the estate agency is asked "Don't you have proper vetting procedures for your employees?" The spin doctor advises him to say "All the procedures in the world can't prevent this sort of isolated incident."
The statement is self-evidently true, but evades the question whether any procedures were in place at all, and gives the journalist a usable quote.
Slightly grubby, but not downright dishonest; that's life. To expect more from politics is like spitting in the wind.