20 down
Worthless
wood
fills
crack
(6)
Worthless wood fills crack (6)
hints
0
checks
0
hints
The definition is at the beginning of the clue.
How the clue works
The definition is Worthless. Think of ASH, a type of wood, slotted inside TRY (as in a crack or attempt at something), and you get TR-ASH-Y.