[f. CLINKER sb.1] To form a clinker in burning. Hence Clinkered ppl. a.

1

1866.  Pall Mall Gaz., 5 May, 9/2. A piece of clinkered coke.

2

1879.  Miss Jackson, Shropsh. Word-bk., s.v., Coals are said to clinker when they cake firmly together in burning.

3