A Scots noun meaning
"a little something", "a bit of scran
" to have
as a snack, especially
with a cup of tea between meals. Believed to be a contraction of "it is nice
to", as in: "It's nice
a biscuit with your tea." It's colloquial, so spelling is unknown. Sometimes (erroneously) pronounced with a "sh" sound, as in "schneister".