Does spirit vinegar contain alcohol

The answer is: Most probably YES!!!

Most types of vinegars and not only the spirit vinegar contain traces of alcohol. Vinegar is fermented from alcohol and some of the alcohol may remain in the resulting mixture.

The amount of alcohol in vinegar is considered to be negligible and vinegars are not intoxicants. If you were to drink/eat vinegar, you should be more worried about the acid and not the alcohol.