a treat en · ADV
Etymology
An ellipsis of like a treat (“thing that gives pleasure”).
Meanings
-
(British, English, colloquial, not-comparable) Very nicely or effectively.
That meal went down a treat.
The plan worked a treat.
“She was goin' a treat yesterday,” lied Sam, removing the sparking plugs.
1970, Richard Carpenter, Catweazle, Harmondsworth: Puffin Books, page 118: