clatter, n.¹ — Green’s Dictionary of Slang

clatter n.¹

[the fig. ‘explosion’ that punctuates each instance of an act]

(US) a ‘time’, an instance.

1897		A.H. Lewis Wolfville 18: He saddles up a pinto pony [...] an’ jumps off every now an’ then for two an’ three days at a clatter.
1906		J.W. Carr ‘Words from Northwest Arkansas’ in DN III:ii 131: clatter, n. In the expression, ‘at one clatter,’ i.e., at one stroke.
1912		J. London Smoke Bellew Pt 10 🌐 Shorty cocked his head triumphantly toward a tin pail of eggs on the table. ‘Seven dollars a clatter, though,’ he confessed.