clunter

'I'll mak a clunter agen th' window wi some gravel, 'said David at last, in desperation.

The History of David Grieve Humphry Ward 1885

Having therefore ground eight bushels of good malt upon our quern, where the toll is saved, she addeth unto it half a bushel of wheat meal, and so much of oats small ground, and so tempereth or mixeth them with the malt that you cannot easily discern the one from the other; otherwise these latter would clunter, fall into lumps, and thereby become unprofitable.

Chronicle and Romance (The Harvard Classics Series) Thomas Malory Jean Froissart

Having therefore ground eight bushels of good malt upon our quern, where the toll is saved, she addeth unto it half a bushel of wheat meal, and so much of oats small ground, and so tempereth or mixeth them with the malt that you cannot easily discern the one from the other; otherwise these latter would clunter, fall into lumps, and thereby become unprofitable.

Of the Food and Diet of the English. Chapter VI. [1577, Book III., Chapter 1; 1587, Book II., Chapter 6 1909