The unclued lights (two of two words) are to be linked with one of the clued lights in translation. All resulting phrases, one doubly hyphened, can be confirmed in Chambers or Brewer.
 

Across

 
1    Roots out – the meal is ready (7, two words)
6    Hood cleans out, applying pressure (7, two words)
11    Some dark colcothar returned on the hour (6)
12    Out east, they played with girl – and no mistake (7)
16    Move rapidly and tread lightly to start with, when jogging (6)
17    Drink with these trifles! (6)
19    Angry moments … as they are? (9)
21   ...